Made all methods virtual.

Author: ilya-murzinov

src/TestStack.White/Drawing/ScreenRectangle.cs

@@ -38,12 +38,12 @@ internal ScreenRectangle(Rect rectangle)
                 Convert.ToInt32(rectangle.Width), Convert.ToInt32(rectangle.Height), 0x10);
         }
 
-        internal void Show()
+        internal virtual void Show()
         {
             TestStack.White.WindowsAPI.NativeWindow.ShowWindow(form.Handle, 8);
         }
 
-        internal void Hide()
+        internal virtual void Hide()
         {
             form.Hide();
         }
@@ -69,7 +69,7 @@ internal FrameRectangle(Rect boundingRectangle)
             rectangles = new ScreenRectangle[] { leftBorder, topBorder, rightBorder, bottomBorder };
         }
 
-        internal void Highlight()
+        internal virtual void Highlight()
         {
             rectangles.ToList().ForEach(x => x.Show());
             Thread.Sleep(CoreAppXmlConfiguration.Instance.HighlightTimeout);

src/TestStack.White/UIItems/UIItem.cs

@@ -429,7 +429,7 @@ public virtual void RaiseClickEvent()
         /// <summary>
         /// Highlight UIItem with red frame
         /// </summary>
-        public void DrawHighlight()
+        public virtual void DrawHighlight()
         {
             Rect rectangle = this.AutomationElement.Current.BoundingRectangle;