Help - IDLE Debugger Source Checkbox??

[SFM]

I have been learning the IDLE Debugger and was wondering if I was
missing something with the "Source" checkbox setting in the debugger.
As I single-step through my program, I have to uncheck and then
recheck this box in order to see the current line in the file editing
window highlighted.  Is there anyway continually see the current line
being executed in the file editor, without unchecking and rechecking
the source setting in the debugger?
Thanks for any insight on this issue.