Development Environment (Browsers, Inspectors, Performance Tools, etc.) : Q: How can I set a breakpoint in a callback handler?

Q: How can I set a breakpoint in a callback handler?
Problem
When a breakpoint is placed in a callback, the debugger pops up with the buttons grayed out and you are unable to step through code.
Solution
This is working as designed because callouts are not allowed while in a callback. So, to be able to step through the code, you will need to execute the code outside the callback. You can do this by following these steps:
1.
Set the breakpoint at the beginning of the method that you want to walk through. For example:

modifyVerifyAreaCode: anObject clientData: clientData callData: callData
2.
3.
Place your cursor in front of the method name in the debugger’s code pane and type self halt;. For example:

self halt; modifyVerifyAreaCode: anObject clientData: clientData callData: callData
4.
5.
Select the (ExHalt) A halt has occurred.==> from the top pane of the debugger.
6.
7.
Click the INTO button on the debugger.
You are now able to step through your code.