Merge branch 'dev/AnimationTimelinesWindowImprovements' of https://github.com/ifromstone/FlaxEngine into ifromstone-dev/AnimationTimelinesWindowImprovements

Source/Engine/UI/GUI/Panels/ScrollBar.cs

@@ -463,6 +463,8 @@ namespace FlaxEngine.GUI
                     // Click change
                     Value = _value + (mousePosition < _thumbCenter ? -1 : 1) * _clickChange;
                 }
+
+                return true;
             }
 
             return base.OnMouseDown(location, button);