I am sure not I understand the exact scenario of your project.
property sets the hole RadWindow
to be disabled and hides all ifs functionality (the header buttons). If the purpose of your project is to disable the controls in the RadWindow and remove the closing button, you can add the IsEnabled="False"
property on the separate controls and set the CanClose property of the RadWindow to false value.
More information on closing in RadWindow in this article
and on the header in this article
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