单声道和winforms控制高度问题

I have been testing my .NET windows applications with Mono on Ubuntu and noticed that my controls are always stretched in height. Width wise appears to be fine. I have a stack of 5 comboboxes that fit nicely within a panel, but with Mono on Ubuntu the comboxes are too tall and the last comboxbox is pushed into the boundary of the panel. Anybody know why this is happening?I have been testing my .NET windows application