private void PaletteControl_MouseClick(object sender, MouseEventArgs e)
{
if (e.X > LeftBorder && e.X < LeftBorder + ColorWidth)
{
if (e.Button == MouseButtons.Left)
SelectedIndex = (e.Y - TopBorder) / ColorDistance;
else if (e.Button == MouseButtons.Right)
SecondarySelectedIndex = (e.Y - TopBorder) / ColorDistance;
}
}