ListMagic question LMListEdited

[J Scott Saults]

Direct support requests to ListMagic have not been answered. Is it  
still supported? Maybe somebody here can help.

I'm trying to use  LMListEdited to selectively prevent changes in a  
list widget, . I've edited the card script to include:

ON LMListEdited pWidget,pItem,pLineNo,pOldValue,pNewValue
    DisplayPrompt "LMListEdited - item" && pItem && "of line" &&  
pLineNo && "-" && pOldValue && ">" && pNewValue
    set itemDel to tab
    put pOldValue into item pItem of line pLineNo of pWidget

Now I expect that last line to replace ANY entry that's changed; if  
that worked, I'd add conditionals. However, it only occasionally  
works. Exactly what events should trigger the LMtListEdited handler -  
tab, return, enter? Changing the item and clicking elsewhere in the  
field usually seems to work (that is, the change is undone, pOldValue  
replaces pNewValue). How do I get other edits intercepted? A user  
might not click, but press tab or enter instead.

Thanks.