private void Palette_OnAddColor(object sender, PaletteEventArgs e)
 {
     AddColorToPalette(e.Color, e.Index);
 }
 private void Palette_OnReplaceColor(object sender, PaletteEventArgs e)
 {
     ReplaceColorInPalette(e.Index, e.Color);
 }
 private void Palette_OnRemoveColor(object sender, PaletteEventArgs e)
 {
     RemoveColorFromPalette(e.Index);
 }