Add raycast support to the ContainerControl

Source/Engine/UI/GUI/ContainerControl.cs

@@ -858,6 +858,14 @@ namespace FlaxEngine.GUI
             }
         }
 
+        /// <inheritdoc />
+        public override bool ContainsPoint(ref Float2 location, bool precise = false)
+        {
+            if (precise && this.GetType() == typeof(ContainerControl) && BackgroundColor.A <= 0.0f) // Go through transparency
+                return false;
+            return base.ContainsPoint(ref location, precise);
+        }
+
         /// <inheritdoc />
         public override void PerformLayout(bool force = false)
         {