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Creating a new 

SfPdfViewer works fine and adding it to a view or giving it a specific frame also works as intended. However, if the Y value is not 0, then changing the device orientation causes the frame to move down and the bottom toolbar to disappear completely. Rotating back does not fix the issue.

I have tried adding to the root View and adding it to a new 

UIView with the latter having the 64px offset. Both break in similar fashions. 

Code Snippit

_pdfViewControl = new SfPdfViewer();

_pdfViewControl.Frame = new CoreGraphics.CGRect(View.Frame.X, View.Frame.Y + 64, View.Frame.Width, View.Frame.Height - 64);