I'm working on a new usercontrol... its not very advanced, just some lines making a "3D Flat Button" which prints text to the center of it, i have the code to draw the lines pushed in... etc... but i want to know when the users moves the mouse "Off" of the control, once that has happend i want it to use the HideLines sub to hide the lines. how can i subclass my form to figure out the mouse has moved off of it, or any other code i can use other than a timer to figure out that the mouse has moved off the usercontrol completely.