I've searched the forum on ShowFocusCues and found one solution that says to derive my own button and override the ShowFocusCues property.
I derive the button like normal, inheriting the system.windows.forms.button
I include this in the bottom of my code before the end of the class
(VB.NET)
Protected Overrides Readonly Property ShowFocusCues() as Boolean
Get
return false
End Get
End Property
When I add the bottom to my form, the button still has that annoying rectangle while the mouse is clicked on it. I'm trying to just make a button have a normal image, and a depressed image when the user has the mouse pressed. The rectangle just gets in the way and looks ugly. I have no idea what I'm doing wrong. Evidentally some other people have had success with it.