protected virtual void OnActivatingKeyTip(ActivatingKeyTipEventArgs e)
{
if (e.OriginalSource == this)
{
e.KeyTipHorizontalPlacement = KeyTipHorizontalPlacement.KeyTipCenterAtTargetCenter;
e.KeyTipVerticalPlacement = KeyTipVerticalPlacement.KeyTipCenterAtTargetCenter;
e.KeyTipHorizontalOffset = e.KeyTipVerticalOffset = 0;
}
}