void controlMouseDown(object sender, MouseEventArgs e)
{
_previousControl = null;
_pressedKey = Keys.LButton;
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData.ToString() == "Tab")
{
_pressedKey = Keys.Tab;
_previousControl = GetFocusControl();
}
else if (keyData.ToString() == "Tab, Shift")
_pressedKey = Keys.Back;
return base.ProcessCmdKey(ref msg, keyData);
}