One of the things that you need to test in a Visual Studio 2012 add-in or package is that is themed correctly when the VS theme is changed dynamically from Dark to Light or viceversa (through the Tools, Options window). I noticed that sometimes the textboxes that show colorized C# or VB.NET code in my MZ-Tools 7.0 add-in were showing an incorrect background for strings, comments and keywords. I use the RichTextBox control and I get the color information from the EnvDTE.FontsAndColorsItems class, as explained in the article:
HOWTO: Get the text editor font and colors information in a Visual Studio add-in
After reading this thread in the VSX forum, I realized that it happened when switching themes. And today I have filed a bug to Microsoft Connect:
EnvDTE.FontsAndColorsItems.Item(“Keyword”).Background not updated after changing theme
And I have documented it here with the workaround that I am using:
BUG: EnvDTE.FontsAndColorsItems.Item(‘Keyword’).Background not updated after changing Visual Studio 2012 theme
The workaround is not perfect but I also played with the RefreshCache method of the IVsFontAndColorCacheManager interface to no avail.