Interrupting a Running Function

I have a bit of an interesting situation, and I am wondering if there is a way to resolve my problem.

While 1   
   Switch GUIGetMsg()
      Case $GUI_EVENT_CLOSE
         Exit
      Case $exitbutton
         Exit
      Case $startbutton
         Run_Setup()
      Case $stopbutton
         ;_Func_2()
      Case $clearbutton
         ClearAll()
   EndSwitch
WEnd
 

Func Run_Setup()
     If GuiCtrlRead($Box1)=1 Then Function1()
     If GuiCtrlRead($Box2)=1 Then Function2()
     If GuiCtrlRead($Box3)=1 Then Function3()
     ...
EndFunc

Where Function1, Function2, Function3 are just a bunch of GUI commands.

Sometimes within those functions something will go wrong (i.e. a WinWaitActive command may be incorrect).

This causes the program to get stuck at that point, and I have to right click on the task bar and terminate the function (because the GUI doesnt have control).

I want to add a "STOP" button to my gui that will terminate whatever is running and just restore my GUI to the original state.

Is there a way to do that?

Note: I have read http://www.autoitscript.com/wiki/Interrupting_a_running_function and it seems that will only be useful when my main function is in a loop and checking on each iteration the value of $fInterrupt...

Any other suggestions?