void _alphaPicker_AlphaChanged(object sender, EventArgs e)
{
_aNumeric.ValueChanged -= _aNumeric_ValueChanged;
_aNumeric.Value = (int)(_alphaPicker.Alpha * 255);
_aNumeric.ValueChanged += _aNumeric_ValueChanged;
_color = Color.FromArgb((int)(_alphaPicker.Alpha * 255), Color);
ColorChanged(this, null);
}
private void _aNumeric_ValueChanged(object sender, EventArgs e)