Hello Jed,
The content of the Upload dialog is declared on the same page which host the RadFileExplorer control. This means that the ContentTemplate of the RadWindow is used and this is why the methods that you try do not work.
Could you please provide me with more information what do you need to achieve? I believe that your requirements can be achieved using the existing API provided by RadControls.
Sincerely yours,
Fiko
the Telerik team
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