private void KeyDownPopupGroup(VisualPopupGroup popupGroup, KeyEventArgs e)
{
switch (e.KeyData)
{
case Keys.Tab | Keys.Shift:
case Keys.Left:
popupGroup.SetPreviousFocusItem();
break;
case Keys.Tab:
case Keys.Right:
popupGroup.SetNextFocusItem();
break;
}
}