Retain position of a DragPanel Extender

[Nilla2010]

HI,
How to retain the position of dynamically created DragPanel Extender after postback ?.In addition i am having multiple panels dragged into the common area to draw a picture. So i have to retain the position of multiple controls.I do have code for retaining position in Javascript for server controls.

 function pageLoad() {
            // call the savePanelPosition when the panel is moved
            $find('DragP1').add_move(savePanelPosition);
            var elem = $get("<%=HiddenField1.ClientID%>");
            if (elem.value != "0") {
                var temp = new Array();
                temp = elem.value.split(';');
                // set the position of the panel manually with the retrieve value
                $find('<%=Panel1_DragPanelExtender.BehaviorID%>').set_location(new Sys.UI.Point(parseInt(temp[0]), parseInt(temp[1])));
            }
}

function savePanelPosition() {
            var elem = $find('DragP1').get_element();
            var loc = $common.getLocation(elem);
            var elem1 = $get("<%=HiddenField1.ClientID%>");
            // store the value in the hidden field
            elem1.value = loc.x + ';' + loc.y;

}

But i dont know how to add it for dynamically created DragPanel and Images in code behind. So i do want o know to how to retain the position and capture the co-ordinates for dynamically created controls.
Thanks,