Highlight, just like when you hover over to the button, its being highlighted. But how do you retain the highlight when you have clicked the button?
                +2 
                A: 
                
                
              
            I don't know exactly why do you need this behaviour, but maybe you could use another control instead of Button. You could use CheckBox, with the appearance of a button. You can change this appearance in the properties window of the checkbox.
If you don't want to use this option, just let me know :-)
                  Javier Morillo
                   2010-03-18 01:28:50
                
              
                +1 
                A: 
                
                
              
            It is not much of a functional spec. When it is supposed to turn off? Anyhoo, use a CheckBox, set Appearance = Button, AutoSize = False, TextAlign = MiddleCenter.
                  Hans Passant
                   2010-03-18 01:35:42
                
              
                +1 
                A: 
                
                
              If this is WPF or Silverlight, you can simply re-template the Button control, and change the "Normal" state to match the "MouseOver" state. Not sure what you're using though?
                  Steve Danner
                   2010-03-18 01:42:13
                
              this is only a winform
                  
                   2010-03-18 02:07:09