To debug a control, select the Debug Control Flow item from the Control Flow menu and complete the Flow Execution dialog. Be aware that a test execution will also implicitly invoke both validation and code generation, so it may take longer than you expect for the debug session to start. The debug session will take place directly in the control flow editor instead of a separate EPG viewer, but operates just like the data flow operator. Figure 6-76 shows a control flow debug session. See 6.3.5, "Testing and debugging a control flow" on page 221, for more details on using and operating the debugger. Attention: The control flow debugger will execute data flows as a black box, and will not step into the data flow EPG. It is expected that you will have already debugged the data flows individually.