DragPanelExtender in Content Page

Hi,

I am trying use DragPanelExtender in Conent Page for display images, below is code

<div style = "width: 800px; height: 600px;"><asp:ScriptManager ID = "scriptManager1" runat = "server" ></asp:ScriptManager><asp:DragPanelExtender ID = "dragPanelExtender1" runat = "server" TargetControlID = "Panel1" DragHandleID = "Image1" Enabled = "true" ></asp:DragPanelExtender><asp:Panel ID = "Panel1" runat = "server" style = "background-color: Yellow; width: 300px; height: 300px;" ClientIDMode = "Static"><asp:Image ID = "Image1" runat = "server" ClientIDMode = "Static" /><br /><asp:LinkButton ID = "lb1" Text = "Previous" runat = "server" onclick="lb1_Click" /><asp:Label ID = "label1" runat = "server" /><asp:LinkButton ID = "lb2" Text = "Next" runat = "server" onclick="lb2_Click" /></asp:Panel></div>

But panel snaps back . What is wrong or missing?

Thank you in advance.

Regards

Krzysztof