FlatButton is an ActiveX control for Visual Basic, which can be used as a CommandButton, a CheckBox or an OptionButton. It has some interesting MouseHover effects.
NOTE: FlatButton isn't supported anymore.
[Changelog] [Download]
Requirements: VB6 Runtime Libraries, Windows 95/98/Me/NT4/2000/XP/2003. It probably also works on Windows Vista/2008.