public override void PreOpen()
{
base.PreOpen();
windowRect = new Rect(windowRect.position, _settings.ColorPickerSize).ExpandedBy(this.Margin);
_model.Size = _settings.ColorPickerSize;
_model.PalletSize = new Vector2(DrawUtility.MaxRGBValue, _defaultPalletHeight);
_model.SliderSize = new Vector2(GenUI.GapWide, _defaultPalletHeight / 3);
_model.RgbTextFieldSize = new Vector2(400f, 100f);
_colorPicker.Build(_model);
}