Initiating postback
The RadDock control has an AutoPostBack property which will make the control initiate a postback when it is moved into another RadDockZone, or when its index in its current zone is changed using drag and drop.
Note: if you do not place the RadDock and RadDockZone controls in a RadDockLayout, the RadDock positions will not be changed automatically.
Another option for initiating a postback is by using client-side code:
<input type="button" value="DoPostBack" onclick="InitiatePostback()" />
function InitiatePostback()
{
$get('<%= RadDock1.ClientID %>').DoPostBack();
}