The problem here is that while VB6 used to require height more than the width so that 1280x1024 worked well, C# requires width more than height, hence why 1440x900 is the minimum.
This is what the class design screen looks at 1440x900 after using the maximized button:
All the buttons are visible, though the bottom ones are slightly cut off due to the Windows taskbar.
Your solution here is to get a screen that supports 16:9 or 16:10 aspect ratio instead of 4:3 or 5:4. If your monitor is very old.
1280x1024 is a 5:4 aspect ration. If you can't do 1440x900 (which is a 16:10 aspect ratio) or 1600x900 (which is a 16:9 aspect ratio), try 1280x960 as that's a 4:3 and might work on your monitor.
