Fixed #1185

Author: joachimmarder

Source/VirtualTrees.pas

@@ -11988,7 +11988,7 @@ function TVTColors.GetColor(const Index: TVTColorEnum): TColor;
 begin
   // Only try to fetch the color via StyleServices if theses are enabled
   // Return default/user defined color otherwise
-  if FOwner.VclStyleEnabled then
+  if not (csDesigning in FOwner.ComponentState) { see issue #1185 } and FOwner.VclStyleEnabled then
     begin
       // If the ElementDetails are not defined, fall back to the SystemColor
       case Index of