NekoRectangle removal and replaced by RectangleSkin FeathersUI native class

src/components/ToolBarToggleButton.hx

@@ -1,11 +1,10 @@
 package components;
 
 import feathers.controls.ToggleButton;
+import feathers.skins.RectangleSkin;
 import feathers.text.TextFormat;
 import format.SVG;
 import model.Constants;
-import openfl.display.Bitmap;
-import openfl.display.BitmapData;
 import openfl.display.Shape;
 import openfl.events.Event;
 import openfl.geom.ColorTransform;
@@ -32,7 +31,7 @@ class ToolbarToggleButton extends ToggleButton {
 
         iconPosition = TOP;
         embedFonts = true;
-        backgroundSkin = new Bitmap(new BitmapData(10, 10, true, 0xFF00FF));
+        backgroundSkin = new RectangleSkin(SolidColor( 0xFF0000, 0));
 
         // icon
         if(svgIconPath != null){