Hi Quan Nguyen,
I am not sure I understand you correctly but you want to overlap RadPane with RadWindow using exact match of their size and position? Does the window should have skin enabled?
In order to obtain the pane's position you can put it in a DIV tag with style="position: absolute; left: 100px; top: 100px"
and some id
where oDiv is reference to this DIV.
You can disable the skin of the window when you set the property EnableEmbeddedSkins="false"
, this will switch off the using of embedded skins. In this way you will automatically lose the titlebar and the status bar skins as well. Here is a sample snippet how it could be done:
| <telerik:RadWindowManager ID="RadWindowManager1" runat="server" EnableEmbeddedSkins="false">
| <telerik:RadWindow ID="RadWindow1" runat="server" VisibleOnPageLoad="true" NavigateUrl="http://www.google.com">
the Telerik team