Visual Studio 2010 has this cool feature that lets the developers have multiple code windows open.
You can now have the similar kind of feature in RadStudio too 
RADSplit is a plugin for Rad Studio by Simon Stuart that enables the developers to make multiple code Windows into dock able editor windows like Visual Studio…
Later, you can organize and dock the windows as per your needs.
Download RADSplit – Mutiple code windows for RadStudio here
