Added arrow as default to groups

Source/Editor/CustomEditors/Dedicated/ScriptsEditor.cs

@@ -642,7 +642,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
                     Checked = script.Enabled,
                     Parent = group.Panel,
                     Size = new Float2(14, 14),
-                    Bounds = new Rectangle(2, 0, 14, 14),
+                    Bounds = new Rectangle(16, 0, 14, 14),
                     BoxSize = 12.0f,
                     Tag = script,
                 };

Source/Editor/CustomEditors/Elements/Container/GroupElement.cs

@@ -13,7 +13,12 @@ namespace FlaxEditor.CustomEditors.Elements
         /// <summary>
         /// The drop panel.
         /// </summary>
-        public readonly DropPanel Panel = new DropPanel();
+        public readonly DropPanel Panel = new DropPanel
+        {
+            ArrowImageClosed = new SpriteBrush(Style.Current.ArrowRight),
+            ArrowImageOpened = new SpriteBrush(Style.Current.ArrowDown),
+            EnableDropDownIcon = true,
+        };
 
         /// <inheritdoc />
         public override ContainerControl ContainerControl => Panel;