System.Drawing isn't available

Without System.Drawing, it’s a pain to do things relating to color without it.
Doing ‘System.Drawing.Color’ gives an error “type name ‘Color’ does not exist”

This is not specific to FxDK. Just add it to your references if you need it

Can I add references with FxDK?

I’m not certain if that’s possible yet. I guess you could at the very least edit your csproj.

I tried to open the solution using visual studio, but it doesn’t let me add system.drawing as a reference. Can you?

Via Visual Studio, sure. I am currently not able to try out FxDK