
It's a standard telerik:RadWindow with a ContentTemplate definition...
5 Answers, 1 is accepted
The event is fired when the page inside the RadWindow is loaded as the name says. However, when you use ContentTemplate, you put the content on the same page and there is no another page loaded in the RadWindow - that is why the event is not fired (to load another page you should use NavigateUrl instead of ContentTemplate).
What I suggest is to use the OnClientShow event for your case and a small timeout if needed, depending on your exact scenario.
In case you need further assistance, please provide more details and some sample code and we will do our best to help.
Svetlina
the Telerik team

Got around it by handling .add_pageLoaded for the time being though...
Thanks
I am afraid that I cannot understand your feature request - if there is no another page, there is no sense of OnClientPageLoad event.
At the time you open the RadWindow all other directly declared RadControls are already created and there is no problem to reference them.
If you dynamically add RadControls and you need to reference them after that on the client, you should use the pageLoad or Sys.Application.add_load syntax and this is so for any ajax client objects, no matter they are inside or outside of a radWindow and no matter they are even RadControls - this is how MS AJAX works.
In case there is some misunderstanding, please explain better your feature request and in case we find it reasonable, we will add it in our database for future consideration.
Svetlina
the Telerik team

http://www.telerik.com/help/aspnet-ajax/listbox-onclientload.html
So instead of wiring up my own event, some controls in the Telerik.Web.UI contain a built-in Load method which fires after it's available :)
Indeed, there are some controls that have such a client event but we do not find it suitable to put such for the RadWindow due to the fact that it is only a container. As to the possible scenarios, when the navigate url is used, there is OnClientPageLoad event - in the case of ContentTemplate you can think of RadWindow as a DIV or panel element.
Greetings,Svetlina
the Telerik team