Hi Christian,
By obtaining a reference to a
RadWindow component, you can call any function that is defined in that windows content window or can access the control placed in teh content window.
Just use the contentWindow property to reference the Content Window of the
RadWindow component:
Here is sample code where the Label is placed inside the content widnow and I'm calling the function from main page.
More information will be available in the documentation:
http://www.telerik.com/help/aspnet-ajax/window_programmingcallingfunctions.html
Thanks,
Princy.