RadWindow is based on an <iframe>, it behaves just like one – basically, whatever can be done with an <iframe>, can be achieved with RadWindow as well. This fact is useful when you investigate a reason for some problem related to the RadWindow control. Just replace the RadWindow with a standard <iframe> and see how your application will behave in this case. If the problem still exists, then it is not related to the RadWindow control but is most probably a default browser’s behavior or a problem in the used logic itself.
The content area of RadWindow is a standard iframe element, the idea of the test is to replace RadWindow with an iframe and to load the same content in it. For example load the contents of the Form2.aspx in the iframe loaded by window.open:
var win = window.open();
win.document.write('<iframe width="560" height="315" src="Form2.aspx?Id=
" frameborder="0" allowfullscreen></iframe>');
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