AsContainer functionality moved to internal to prevent problems in Get and Exist methods

src/TestStack.White/UIItems/UIItem.cs

@@ -527,6 +527,18 @@ public virtual void ActionPerformed(Action action)
         /// <returns>Returns an <c><see cref="IUIItemContainer"/></c> if possibe</returns>
         public virtual IUIItemContainer AsContainer()
         {
+            return AsContainerInternal();
+        }
+
+        #endregion
+
+        #region Internal
+
+        internal virtual IUIItemContainer AsContainerInternal()
+        {
+            // This function needs to be internal because all public method from this
+            // class call interceptors. Sometimes we don't need focus on element, for
+            // example in GetMultiple method, so this method created for internal usage.
             if (Framework != WindowsFramework.Wpf)
             {
                 Logger.Warn("Only WPF items should be treated as container items");

src/TestStack.White/UIItems/WPFUIItems/WPFUIItem.cs

@@ -144,7 +144,7 @@ private static IUIItemContainer GetUiItemContainer(IUIItem uiItem)
             {
                 throw new WhiteException("Cannot get UI Item container, uiItem must be an instance of UIItem");
             }
-            return item.AsContainer();
+            return item.AsContainerInternal();
         }
 
         #endregion