Панель обновления не работает асинхронно

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Привет.
У меня есть главная страница, где я разместил менеджер сценариев, как в разделе:

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>

На странице содержимого у меня есть панель обновления с Даталистом и кнопкой следующим образом:

    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
    <asp:DataList ID="DataList1" runat="server" onitemdatabound="DataList1_ItemDataBound" RepeatLayout="Flow">
    <ItemTemplate>
     <div class="post-heading">
	  <div class="pull-left image">
		<img src="abc.jpg" class="img-circle avatar" alt="user profile image">
	  </div>
	 <div class="pull-left meta">
	  <div class="title h5">
	   <a href="#"><b>Ryan Haywood</b></a>
		made a post.
	  </div>
	  <h6 class="text-muted time">1 minute ago</h6>
	 </div>
	</div> 
    <div class="post-description"> 
     <asp:Image ID="Image2" class="img img-responsive" ImageUrl='<%#Eval ("pimg") %>' runat="server" />
     <p><asp:Label ID="postlabel" class="postlabel" runat="server" Text='<%#Eval ("ptext") %>'></asp:Label></p>
	 <div class="stats">
	  <a href="#" class="btn btn-default stat-item">
	   <i class="fa fa-thumbs-up icon"></i>2
	  </a>
      <a href="#" class="btn btn-default stat-item">
	   <i class="fa fa-share icon"></i>12
      </a>
	 </div>
	</div>
    <div class="post-footer">
	 <div class="input-group"> 
	  <input class="form-control" placeholder="Add a comment" type="text">
	   <span class="input-group-addon">
	    <a href="#"><i class="fa fa-edit"></i></a>  
	   </span>
	 </div>
	</div>
    </ItemTemplate>
    </asp:DataList>
    <asp:Button ID="Button2" class="btn-block btn-primary" runat="server" Text="Load More" onclick="Button2_Click" ClientIDMode="Static" />
    </ContentTemplate>
    <Triggers>
     <asp:AsyncPostBackTrigger ControlID="Button2" EventName="Click" />
    </Triggers>
    </asp:UpdatePanel>
The problem is that when I click on this Load More button, data is fetched fine but full page postback is happening instead of partial postback.
Why and how it can be resolved?

What I have tried:

I have tried to place the button outside the update panel, still it didnt work

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