Hi Mirek,

On Windows 10 it all still works (after adding Ctrl::SetDarkThemeEnabled(); ).

On Windows 7 the symptoms I mentioned in my last message remain.

Another thing I noticed is that Windows 10 1809 does not alter any icon color at all (or maybe just pure black/white) when switching between light and dark themes. (Please take a look at Windows "File Explorer" toolbar icons while toggling between Light and Dark app modes on Windows > Settings > Personalization > Colors.) For this to work properly, all icons must be colored in a way that prevents them from sinking into the background. Sorry to bring this up this late down the road, but after using TheIDE with dark theme for a while, I have now noticed that I have some difficulty to identify certain TheIDE icons (e.g. Build and Rebuild All on the toolbar) in their dark variant. This may be related to the fact that I have red-green colorblindness (as about 8 % of males do). Using light theme icons on dark background would in most cases work better for me after all. Of course there are some icons that would need to be changed in order to be visible on both dark and light backgrounds. This involves changing from black to mid-grey to support both white and black backgrounds with a single icon.