Как переместить, свернуть и восстановить без полей & настроенную форму в partent-child mode inc# windowsforms

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Привет, Ребята... я пытаюсь сделать свою собственную пользовательскую форму для моего заявления.

я создал новый класс с этими данными

<pre> <pre> public class CustomizedForm : Form
    {
        private Color backgroundColor1 = ColorTranslator.FromHtml("#74ebd5");
        private Color backgroundColor2 = ColorTranslator.FromHtml("#ACB6E5");

        private Color borderColor = ColorTranslator.FromHtml("#274046");
        private GUI.ControlBox.CustomizedControlBox CCB;
        private bool resizeable = true;
        public Size CustomFormSize;
        [CategoryAttribute("CustomizedControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool ShowCloseButton
        {
            get { return CCB.CloseIsEnabled; }
            set { this.CCB.CloseIsEnabled = value; }
        }
        [CategoryAttribute("CustomizedControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool ShowMaxmizeButton
        {
            get { return CCB.MaximizeIsEnabled; }
            set { this.CCB.MaximizeIsEnabled = value; }
        }
        [CategoryAttribute("CustomizedControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool ShowMinmizeButton
        {
            get { return CCB.MinimizeIsEnabled; }
            set { this.CCB.MinimizeIsEnabled = value; }
        }
        [CategoryAttribute("CustomizedControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool ShowReloadButton
        {
            get { return CCB.RefreshIsEnabled; }
            set { this.CCB.RefreshIsEnabled = value; }
        }

        [CategoryAttribute("CustomizedControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool Resizeable
        {
            get { return resizeable; }
            set { resizeable = value; }
        }

        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn
(
    int nLeftRect, // x-coordinate of upper-left corner
    int nTopRect, // y-coordinate of upper-left corner
    int nRightRect, // x-coordinate of lower-right corner
    int nBottomRect, // y-coordinate of lower-right corner
    int nWidthEllipse, // height of ellipse
    int nHeightEllipse // width of ellipse
 );
        public Bitmap THE_ICON
        {
            get
            {
                try
                {
                    return CCB.THE_ICON;
                }
                catch { return null; }
            }
            set
            {
                CCB.THE_ICON = value; Invalidate();
            }
        }

        public Color BackgroundColor1
        {
            get { return backgroundColor1; }
            set { backgroundColor1 = value; Invalidate(); }
        }

        public Color BackgroundColor2
        {
            get { return backgroundColor2; }
            set { backgroundColor2 = value; Invalidate(); }
        }

        public Color BorderColor
        {
            get { return borderColor; }
            set { borderColor = value; Invalidate(); }
        }

        public CuteForm()
        {
            this.FormBorderStyle = FormBorderStyle.None;
            this.DoubleBuffered = true;
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            CCB = new GUI.ControlBox.CustomizedControlBox(this.Handle, this);
            this.Invoke((MethodInvoker)delegate
            {
                //perform on the UI thread
                this.Controls.Add(this.CCB);
            });
            if (this.StartPosition == FormStartPosition.CenterScreen)
                this.CenterToScreen();
            else if (this.StartPosition == FormStartPosition.CenterParent)
                this.CenterToParent();
            BorderColor = ColorTranslator.FromHtml("#2B32B2");
            this.ShowReloadButton = false;
            if (this.Height > Screen.PrimaryScreen.WorkingArea.Size.Height)
            {
                this.Height = Screen.PrimaryScreen.WorkingArea.Size.Height;
                this.Update();
            }
        }

        private ButtonBorderStyle BBS = ButtonBorderStyle.Solid;
        private const int
    HTLEFT = 10,
    HTRIGHT = 11,
    HTTOP = 12,
    HTTOPLEFT = 13,
    HTTOPRIGHT = 14,
    HTBOTTOM = 15,
    HTBOTTOMLEFT = 16,
    HTBOTTOMRIGHT = 17;
        const int _ = 10; // you can rename this variable if you like

        Rectangle Top { get { return new Rectangle(0, 0, this.ClientSize.Width, _); } }
        Rectangle Left { get { return new Rectangle(0, 0, _, this.ClientSize.Height); } }
        Rectangle Bottom { get { return new Rectangle(0, this.ClientSize.Height - _, this.ClientSize.Width, _); } }
        Rectangle Right { get { return new Rectangle(this.ClientSize.Width - _, 0, _, this.ClientSize.Height); } }

        Rectangle TopLeft { get { return new Rectangle(0, 0, _, _); } }
        Rectangle TopRight { get { return new Rectangle(this.ClientSize.Width - _, 0, _, _); } }
        Rectangle BottomLeft { get { return new Rectangle(0, this.ClientSize.Height - _, _, _); } }
        Rectangle BottomRight { get { return new Rectangle(this.ClientSize.Width - _, this.ClientSize.Height - _, _, _); } }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
            if (ClientRectangle.Width == 0 && ClientRectangle.Height == 0)
                return;

            Brush b = new System.Drawing.Drawing2D.LinearGradientBrush(new Point(0, 0), new Point(this.Width, this.Height), backgroundColor1, backgroundColor2);
            pe.Graphics.FillRectangle(b, ClientRectangle);
            ControlPaint.DrawBorder(pe.Graphics, ClientRectangle, borderColor, 3, BBS, borderColor, 3, BBS, borderColor, 3, BBS, borderColor, 3, BBS);
            b.Dispose();
        }

        protected override void OnClientSizeChanged(EventArgs e)
        {
            base.OnClientSizeChanged(e);
            if (this.Height > Screen.PrimaryScreen.WorkingArea.Size.Height)
            {
                this.Height = Screen.PrimaryScreen.WorkingArea.Size.Height;
                this.Update();
            }
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);
            if (this.Size.Height < CustomFormSize.Height)
                this.Height = CustomFormSize.Height;
            if (this.Size.Width < CustomFormSize.Width)
                this.Width = CustomFormSize.Width;
            if (this.Height > Screen.PrimaryScreen.WorkingArea.Size.Height)
                this.Height = Screen.PrimaryScreen.WorkingArea.Size.Height;
            if (this.Width < 120)
                this.Width = 120;
            if (this.Height < 50)
                this.Height = 50;
            this.Update();
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            if (this.StartPosition == FormStartPosition.CenterScreen)
                this.CenterToScreen();
            else if (this.StartPosition == FormStartPosition.CenterParent)
                this.CenterToParent();

            if (this.WindowState == FormWindowState.Maximized)
            {
                this.WindowState = FormWindowState.Normal;

                this.Size = new Size(Screen.PrimaryScreen.WorkingArea.Size.Width, Screen.PrimaryScreen.WorkingArea.Size.Height);
            }
        }

        protected override void WndProc(ref Message message)
        {
            base.WndProc(ref message);
            if (!Resizeable) return;
            if (message.Msg == 0x84) // WM_NCHITTEST
            {
                var cursor = this.PointToClient(Cursor.Position);

                if (TopLeft.Contains(cursor)) message.Result = (IntPtr)HTTOPLEFT;
                else if (TopRight.Contains(cursor)) message.Result = (IntPtr)HTTOPRIGHT;
                else if (BottomLeft.Contains(cursor)) message.Result = (IntPtr)HTBOTTOMLEFT;
                else if (BottomRight.Contains(cursor)) message.Result = (IntPtr)HTBOTTOMRIGHT;

                else if (Top.Contains(cursor)) message.Result = (IntPtr)HTTOP;
                else if (Left.Contains(cursor)) message.Result = (IntPtr)HTLEFT;
                else if (Right.Contains(cursor)) message.Result = (IntPtr)HTRIGHT;
                else if (Bottom.Contains(cursor)) message.Result = (IntPtr)HTBOTTOM;
            }
        }
    }

а для верхней панели, которая содержит (значок, заголовок и блок управления), я создал новую настраиваемую панель для этой цели...

<pre>public class CustomizedControlBox: Panel
    {
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HTCAPTION = 0x2;
        [DllImport("User32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("User32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        private Color background_Color1 = ColorTranslator.FromHtml("#2B32B2");
        private Color background_Color2 = ColorTranslator.FromHtml("#2B32B2");
        private GUI.Button_.CloseButton CloseBtn;
        private GUI.Button_.MaximizeButton MaxBtn;
        private GUI.Button_.MinimizeButton MinBtn;
        private GUI.Button_.ReloadButton RefreshBtn;
        private Label Title;
        IntPtr Parent_Handle;
        private GUI.Form_.CustomizedForm CF;
        private PictureBox iCON;
        private Bitmap _I_C_O_N;
        public Bitmap THE_ICON
        {
            get
            {
                if (_I_C_O_N == null)
                    return Properties.Resources.HS_FAV_PNG;
                else
                    return _I_C_O_N;
            }
            set
            {
                _I_C_O_N = value;
            }
        }
        
        [CategoryAttribute("CuteControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool CloseIsEnabled
        {
            get { return CloseBtn.IsEnabled; }
            set { CloseBtn.IsEnabled = value; ValidateButtons(); }
        }
        [CategoryAttribute("CuteControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool MaximizeIsEnabled
        {
            get { return MaxBtn.IsEnabled; }
            set { MaxBtn.IsEnabled = value; ValidateButtons(); }
        }
        [CategoryAttribute("CuteControlBoxAppearance")]
        [IODescriptionAttribute("ControlBoxTypeDescr")]
        public bool MinimizeIsEnabled
        {
            get { return MinBtn.IsEnabled; }
            set { MinBtn.IsEnabled = value; ValidateButtons(); }
        }
        public bool RefreshIsEnabled
        {
            get { return RefreshBtn.IsEnabled; }
            set { RefreshBtn.IsEnabled = value; ValidateButtons(); }
        }
        //    [System.ComponentModel.DefaultValue(typeof(DockStyle), "Fill")]
        public CuteControlBox(IntPtr _Handle, GUI.Form_.CustomizedForm _CF)
        {
            this.DoubleBuffered = true;
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.Parent_Handle = _Handle;
            this.CF = _CF;
            this.Dock = DockStyle.Top;
            this.Height = 30;
            this.Margin = new Padding(0, 0, 0, 10);
            this.Location = new Point(0, 0);

            this.CloseBtn = new ONTIME_CLIENT.GUI.Button_.CloseButton(CF);
            this.CloseBtn.Name = "CloseBtn";
            this.CloseBtn.TabIndex = 0;

            this.MaxBtn = new ONTIME_CLIENT.GUI.Button_.MaximizeButton(CF);
            this.MaxBtn.Name = "MaxBtn";
            this.MaxBtn.TabIndex = 1;

            this.MinBtn = new ONTIME_CLIENT.GUI.Button_.MinimizeButton(CF);
            this.MinBtn.Name = "MinBtn";
            this.MinBtn.TabIndex = 2;

            this.RefreshBtn = new ONTIME_CLIENT.GUI.Button_.ReloadButton(CF);
            this.RefreshBtn.Name = "RefreshBtn";
            this.RefreshBtn.TabIndex = 3;

            this.Title = new Label();
            this.Title.Location = new Point(26, 0);
            this.Title.Font = new Font("Calibri", 10, FontStyle.Regular);
            this.Title.AutoSize = false;
            this.Title.Height = 30;
            this.Title.Text = _CF.Text;
            this.Title.BackColor = Color.Transparent;
            this.Title.ForeColor = Color.White;
            this.Title.TextAlign = ContentAlignment.MiddleCenter;

            this.iCON = new PictureBox();
            this.iCON.BackColor = Color.Transparent;
            this.iCON.Location = new Point(5, 5);
            this.iCON.Size = new Size(19, 19);
            this.iCON.Image = THE_ICON;
            this.iCON.SizeMode = PictureBoxSizeMode.StretchImage;

            //this.Invoke((MethodInvoker)delegate
            //{
            //perform on the UI thread
            this.Controls.Add(this.CloseBtn);
            this.Controls.Add(this.MaxBtn);
            this.Controls.Add(this.MinBtn);
            this.Controls.Add(this.RefreshBtn);
            this.Controls.Add(this.Title);
            this.Controls.Add(this.iCON);
            //});
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
            DrawControlBox(pe);
        }

        private void Title_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Parent_Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
            }
        }

        protected override void OnControlAdded(ControlEventArgs e)
        {
            base.OnControlAdded(e);
            this.Dock = DockStyle.Top;
            this.Height = 30;
            this.Margin = new Padding(0, 0, 0, 10);
            this.Location = new Point(0, 0);
        }

        protected override void OnSizeChanged(EventArgs e)
        {
            base.OnSizeChanged(e);
            //this.Height = 30;
            //this.Margin = new Padding(0, 0, 0, 10);
            //this.Location = new Point(0, 0);
        }

        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);
            if (e.Button == MouseButtons.Left)
            {
                this.Cursor = Cursors.SizeAll;
                ReleaseCapture();
                SendMessage(Parent_Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
                Program.Log(Parent_Handle.ToString());
            }
        }
        protected override void OnMouseEnter(EventArgs e)
        {
            base.OnMouseEnter(e);
            this.Cursor = Cursors.Default;
        }
        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);
                this.Cursor = Cursors.Default;
        }

        protected override void OnResize(EventArgs eventargs)
        {
            base.OnResize(eventargs);

            int fullwidth = this.Width;
            if (CloseBtn != null)
            {
                int ColseButtonX = fullwidth - CloseBtn.Width - 7;
                this.CloseBtn.Location = new System.Drawing.Point(ColseButtonX, 7);
                int MaxButtonX = ColseButtonX - CloseBtn.Width - 2;
                this.MaxBtn.Location = new System.Drawing.Point(MaxButtonX, 7);
                int MinButtonX = MaxButtonX - CloseBtn.Width - 2;
                this.MinBtn.Location = new System.Drawing.Point(MinButtonX, 7);
                int RefreshBtnX = MinButtonX - CloseBtn.Width - 2;
                this.RefreshBtn.Location = new System.Drawing.Point(RefreshBtnX, 7);
            }
        }

        private void DrawControlBox(PaintEventArgs pe)
        {
            int fullwidth = this.Width;
            int ColseButtonX = fullwidth - CloseBtn.Width - 7;
            this.CloseBtn.Location = new System.Drawing.Point(ColseButtonX, 7);
            int MaxButtonX = ColseButtonX - CloseBtn.Width - 2;
            this.MaxBtn.Location = new System.Drawing.Point(MaxButtonX, 7);
            int MinButtonX = MaxButtonX - CloseBtn.Width - 2;
            this.MinBtn.Location = new System.Drawing.Point(MinButtonX, 7);
            int RefreshBtnX = MinButtonX - CloseBtn.Width - 2;
            this.RefreshBtn.Location = new System.Drawing.Point(RefreshBtnX, 7);
            this.Title.Text = CF.Text;
            this.Title.Width = TextRenderer.MeasureText(CF.Text, this.Title.Font).Width;
            this.Title.MouseDown += Title_MouseDown;

            Brush b = new System.Drawing.Drawing2D.LinearGradientBrush(new Point(0, 0), new Point(this.Width, this.Height), background_Color2, background_Color1);
            pe.Graphics.FillRectangle(b, ClientRectangle);
            b.Dispose();
        }

        private void ValidateButtons()
        {
            if (!this.CloseIsEnabled && !this.MaximizeIsEnabled && !this.MinimizeIsEnabled)
            {
                this.Controls.Remove(CloseBtn);
                this.Controls.Remove(MaxBtn);
                this.Controls.Remove(MinBtn);
            }
            else if (this.CloseIsEnabled && !this.MaximizeIsEnabled && !this.MinimizeIsEnabled)
            {
                this.Controls.Remove(MaxBtn);
                this.Controls.Remove(MinBtn);
            }
            try
            {
                if (!RefreshIsEnabled)
                    this.Controls.Remove(RefreshBtn);
                else this.Controls.Add(RefreshBtn);
            }
            catch { }
        }
    }

и я назначил задание для каждой кнопки в блоке управления, например (закрыть, максимизировать и минимизировать).
Кроме того, я могу добавить больше кнопок, если захочу...

но проблема теперь в том, что я могу только перетащить основную форму (MDI Parent) с новым блоком управления, но я больше не могу перемещать детей...

Что я уже пробовал:

попытался назначить ребенка родителю, используя этот код

[System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

SINGLE_DISPLAY_FORM frm = new SINGLE_DISPLAY_FORM();
                frm.Show();
                SetParent(frm.Handle, this.Handle);

Теперь я могу перемещать детей, но когда я минимизирую детскую форму, она исчезает, пока она все еще работает, и я не могу вернуть ее обратно, чтобы показать снова.

как я могу справиться с этим ?

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