Text Editor for Source Code. Supports many languages and customizable themes.
The main text control is a scintilla control. Everything is included in order to build RadNotepadMFC. If you want to download the scintilla source:
msbuild ScintillaPre.vcxproj /t:Update
msbuild LexillaPre.vcxproj /t:Updatemsbuild RadNotepad.vcxproj -p:Configuration=Release -p:Platform=x64