Making a contorl visble when a mouse cursor is on it...................................

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C#

My doubt is simple i want to make a button visible when mouse cursor is on the control and should be invisible when mouse cursor is moved away from it..???? :doh: :confused:
I have handiled an event of an group box called MouseHover event. The group box is becoming visble when mouse cursor is on it. But, When cursor is moved away from it, then even it is visble. Example code is here:-

private void groupBox2_MouseHover(object sender, EventArgs e)
{
              button10.Visible = true;
}

Please help me out. Thank you in advance.................... :)