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When using medium magnification, 125%, "Next" and "Cancel" buttons are not displayed properly - they are partially hidden at their bottom as in attached image. This is serious bug. I'm programmer myself, and I know how important is
to test the UI in all three magnifications: 100%, 125% and 150%.
I have Windows 8.1 64 bit.
Another minor inconvenience is when adding your controls to Visual Studio 2013 Toolbox, they are displayed rogue - without suitable image.