Changing an existing control's attributes

Hello,
I am trying to change the line color of a group box so that when the
user moves the mouse over the control, it starts flickering or the color
of the line drawing of the group box changes to a more distinguished
color. How do i do this? I know that a groupbox has a Bounds property
which gives a handle to the rectangle of the control. Do i need to
create a new graphics and pen object or is there an easier way to change
the line color?
thanks,
BRAMOIN

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