Question:
Is it possible to step through the VCL code with using integrated
debugging?
Answer:
Yes! If you have the Developer or Client Server versions of Delphi
or C++ Builder, simply add the path to the VCL directory at the
beginning of your Library search path. To get there from the IDE's
MainMenu, select: Tools > Environment Options, and then select the
Library page from the dialog, and look for the Library Path option.