Copy the PageProperties.ascx file from your Telerik installation folder (usually c:\Program Files(x86)\Telerik\RadControls For ASP.NET AJAX XXXXXX\EditorDialogs) in the folder assigned to the ExternalDialogsPath property
For your convenience I have attached modified PageProperties.ascx file.
More information regarding how to customize built-in dialogs is available in the following Live Demo: Customize Built-in Dialogs
Sincerely yours,
Dobromir
the Telerik team
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