Using native themes makes menu items blurry

Hi,

I am using Actipro Docking for WPF. I have enabled using native themes globally by adding the line

ThemeManager.AreNativeThemesEnabled = true;

 in my App.xaml.cs class. However, by doing so, the text of (nested) menu items in my application appears blurry, while the problem is fixed by disabling native themes.

The same happens with the text in drop-down menus in Tool windows and Document windows (the Dock/Close/Float etc menus).

What's bugging me is that my window.xaml looks pretty much the same as the one in the Sample Browser, in the NativeControlThemes demo, which looks fine.

My menu, toolbar and statusbar controls are enclosed in a PixelSnapper, as are in the sample, but that makes no difference.

Anyone encountered anything similar before? Any ideas on how to fix this problem?