The solution you can currently implement is the following:
Put the PdfViewer in RadWindow
Add a template button to the toolbar of the PdfViewer which when clicked will maximize RadWindow or restore it depending on the window state. You can see how to add custom toolbar buttons on the PDFViewer in the Toolbar Templates demo. The client method to maximize RadWindow is called with the same name - maximize(). You can find information for it at https://www.telerik.com/forums/radwindow-set-to-maximized-upon-open#rADkegn-30CmWg51PJWutw and Methods that Check a Condition or Invoke a Certain Behavior. The isMaximized boolean property will tell you whether the window is maximized or not. The restore() method restores the RadWindow to its normal (non-minimized) state.
Thank you once again for your feature request. Your Telerik points were updated.
Regards,
Rumen
Progress Telerik
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