Hello,
Sure, I agree, but it was working fine a couple of revisions ago (4.2) and there were no updates for the OS since then. Sorry, installing Windows 10 to fix this is out of the question for now, that's why I suggested that you manually override X position of the two buttons using the half-width of the window frame. The .NET is just an API, like any other, so calling the correct resize and position functions will not hurt. Every API ( of the ones that I've used so far ) is able to precisely position a button object in a frame via basic methods ( button.setPos(px, py); button.setSize(sx, sy) ), so I doubt that doing this on .NET is that hard.