>>>Thanks a lot for your input. Sergey thinks it's related to the base textbox class IntegralHeight property, but I would think it's a weird bug. I'm not sure I have to try to change my parent class height for textboxes to 22 (the original problem showed up then I left one parent class textbox height to be 22 in bold and only this one was 22 in the child and my manager noticed that difference in run time). Since now all child textboxes will have 21 as their height, may be it's Ok? I doubt the users will pick this difference in apperance now...
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>>Don't count on it!
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>So, would you suggest to make it 22 in the parent form class for each textbox?

My suggestion would be to do what works. The users won't scream about a pixel too loudly.