You need to set the flag at the beginning of the method code because there may be a pre-mature code exit ( as supported by Jim Nelson ) like this

if some condition
  return
endif
code
code
code 
if some other condition
  return
endif
code 
code 
return

>>I have a VFP 8 multiple page pageframe that contains about 100 text boxes. I want to stick in a line of code, "m_fieldmodified=.T.", in the interactivechange event of each text box. Many of the text boxes already have text in the interactive change event. Is there a quick way of doing this?
>>
>>Thanks,
>>
>>Vim
>
>This method works best for each individual page.
>
>Edit the page in the pageframe.
>Select all the checkboxes you want to change.
>Run the following code.
>

ASelObj(laCheck)
>For Each loCheck in laCheck
>  lcCode=loCheck.ReadMethod("InteractiveChange")
>  lcCode=lcCode+Chr(13)+"m_fieldmodified=.T."
>  loCheck.WriteMethod("InteractiveChange", lcCode)
>Next

>You may need to modify this code to put the line at the appropriate place, but it should get you started.