I'm not sure what you're asking... are you asking how you can use RSTA as the source component in a debugger? RSTA can handle the syntax highlighting, line coloring, and icons in a row header (breakpoint markers, etc.). For the actual stepping through code, variable watches, etc. (the "debugger" part of the debugger) you'll have to implement them yourself.
If I'm not understanding you, post back and let me know what you're looking for.