The GDI Compatibility options page contains options for old plug-ins compatibility.
CodeRush Classic 10.1 or later implements a new visual element painting engine. Plug-ins developed for earlier versions of CodeRush Classic can work incorrectly, because they use obsolete events. The GDI Compatibility options page includes options that specify availability of some obsolete events. The default configuration provides optimal compatibility and performance. Making an event available causes a light performance loss, but increases compatibility.
The GDI compatibility options affect Visual Studio 2008 and earlier. Visual Studio 2010 does not support the listed events.