Graphics for picture based controls

mkap7's icon

Hi folks,
I'm trying to customize a button, and using the "picture based control" option. In the Info window for the button, there is a place to choose the file. I put the file inside the project folder and add it to the project, and have no trouble choosing for the button. Problem is, MAX is cropping the button picture file, and in what is to me a completely incomprehensible way. Does anyone have any pointers for making and using button picture files?
Thanks,
-mk