vcl: fix build

Change-Id: I51d992e9befc78f6e429480e29bfb78e9be87ac2

vcl/source/window/toolbox2.cxx

@@ -357,7 +357,7 @@ void ToolBox::ImplInvalidate( bool bNewCalc, bool bFullPaint )
         {
             Invalidate( Rectangle( mnLeftBorder, mnTopBorder,
                                    mnDX-mnRightBorder-1, mnDY-mnBottomBorder-1 ) );
-            maIdle.Stop();
+            mpIdle->Stop();
         }
     }
     else
@@ -368,7 +368,7 @@ void ToolBox::ImplInvalidate( bool bNewCalc, bool bFullPaint )
 
             // do we need to redraw?
             if ( IsReallyVisible() && IsUpdateMode() )
-                maIdle.Start();
+                mpIdle->Start();
         }
     }