Hi,
You should get a reference to the parent page(where the RadWindowManager is) and use
parentPage.Telerik.Web.UI.WindowBehaviors.Close instead of
Telerik.Web.UI.WindowBehaviors.Close .
I created for you a simple example, which illustrates how to open a RadWindow from a button which is inside another RadWindow.
Default.aspx
ContentWindow.aspx
Hope this helps.
All the best,
Petio Petkov
the Telerik team
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