private void comboKeys_SelectedIndexChanged(object sender, EventArgs e)
{
string keyName = comboKeys.SelectedItem.ToString();
Keys key = (Keys)Enum.Parse(typeof(Keys), keyName);
Keys newKeyCombination = key;
if ((_keyCombination & Keys.Alt) == Keys.Alt)
newKeyCombination |= Keys.Alt;
if ((_keyCombination & Keys.Shift) == Keys.Shift)
newKeyCombination |= Keys.Shift;
if ((_keyCombination & Keys.Control) == Keys.Control)
newKeyCombination |= Keys.Control;
_keyCombination = newKeyCombination;
lblKeyCombination.Text = _keyCombination.ToExpression();
}