New button styling

Source/Editor/CustomEditors/Dedicated/UIControlEditor.cs

@@ -487,10 +487,37 @@ namespace FlaxEditor.CustomEditors.Dedicated
 
             BuildLocationSizeOffsets(horUp, horDown, _cachedXEq, _cachedYEq, valueTypes);
 
+            BuildExtraButtons(group);
+
             main.Space(10);
             BuildAnchorsDropper(main, valueTypes);
         }
 
+        private void BuildExtraButtons(VerticalPanelElement group)
+        {
+            var panel = group.CustomContainer<Panel>();
+            panel.CustomControl.Height = TextBoxBase.DefaultHeight;
+            panel.CustomControl.ClipChildren = false;
+            panel.CustomControl.Parent = group.ContainerControl;
+            panel.CustomControl.Y += 50;
+
+            var pivotSizeRelativeBtn = new Button()
+            {
+                Parent = panel.ContainerControl,
+                Width = 18,
+                Height = 18,
+                BackgroundBrush = new SpriteBrush(Editor.Instance.Icons.Scale32),
+                AnchorPreset = AnchorPresets.TopRight,
+            };
+            pivotSizeRelativeBtn.Clicked += () =>
+            {
+                var current = (Values[0] as Control).PivotRelative;
+                (Values[0] as Control).PivotRelative = !current;
+                pivotSizeRelativeBtn.BorderColor = current ? Color.Transparent : Color.AliceBlue;
+                pivotSizeRelativeBtn.BackgroundColor = current ? Color.Gray : Color.White;
+            };
+        }
+
         private void BuildAnchorsDropper(LayoutElementsContainer main, ScriptType[] valueTypes)
         {
             ScriptMemberInfo minInfo = valueTypes[0].GetProperty("AnchorMin");

Source/Engine/UI/GUI/Control.Bounds.cs

@@ -1,6 +1,7 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
 using System;
+using System.Runtime.Remoting.Messaging;
 
 namespace FlaxEngine.GUI
 {
@@ -172,8 +173,12 @@ namespace FlaxEngine.GUI
         /// <summary>
         /// Whether to resize the UI Control based on where the pivot is rather than just the top-left.
         /// </summary>
-        [ExpandGroups, EditorDisplay("Transform"), EditorOrder(1060)]
-        public bool PivotRelative = false;
+        [NoSerialize, HideInEditor]
+        public bool PivotRelative
+        {
+            get => _pivotRelativeSizing;
+            set => _pivotRelativeSizing = value;
+        }
 
         /// <summary>
         /// Gets or sets width of the control.

Source/Engine/UI/GUI/Control.cs

@@ -76,6 +76,7 @@ namespace FlaxEngine.GUI
         private float _rotation;
         internal Matrix3x3 _cachedTransform;
         internal Matrix3x3 _cachedTransformInv;
+        private bool _pivotRelativeSizing = false;
 
         // Style