Add GroupElement.AddSettingsButton for editor ui

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

@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+using FlaxEngine;
 using FlaxEngine.GUI;
 
 namespace FlaxEditor.CustomEditors.Elements
@@ -25,5 +26,27 @@ namespace FlaxEditor.CustomEditors.Elements
 
         /// <inheritdoc />
         public override ContainerControl ContainerControl => Panel;
+
+        /// <summary>
+        /// Adds utility settings button to the group header.
+        /// </summary>
+        /// <returns>The created control.</returns>
+        public Image AddSettingsButton()
+        {
+            var style = Style.Current;
+            var settingsButtonSize = Panel.HeaderHeight;
+            return new Image
+            {
+                TooltipText = "Settings",
+                AutoFocus = true,
+                AnchorPreset = AnchorPresets.TopRight,
+                Parent = Panel,
+                Bounds = new Rectangle(Panel.Width - settingsButtonSize, 0, settingsButtonSize, settingsButtonSize),
+                IsScrollable = false,
+                Color = style.ForegroundGrey,
+                Margin = new Margin(1),
+                Brush = new SpriteBrush(style.Settings),
+            };
+        }
     }
 }