In your scenario I recommend you set the ReloadOnShow="true" in ExplorerWindow's declaration. This will cause the RadWindow
's content to be reloaded every time it is shown. Also you could set it on the client by using this approach:
_globobjectartselect = val;
wnd = $find(
"<%= ExplorerWindow.ClientID %>"
This will cause the window to be reloaded (the Page_Load event to be called) every time ExplorerWindow is shown).
I hope this helps.
the Telerik team