One of my dissatisfaction when creating a popup shortcut via Define Popup and later On Selection Popup or On Selection Bar commands is its insistence of not accepting Thisform reference. Something like this:
Define Popup PopFaves From Mrow(),Mcol() Margin SHORTCUT
Define Bar 1 Of PopFaves Prompt "Add to My Favorite"
Define Bar 2 Of PopFaves Prompt "Remove from My Favorite"
Define Bar 3 Of PopFaves Prompt "Show My Favorite"
On Selection Popup PopFaves Thisform._SubFave(Bar(), m.lcCaption)
Activate Popup PopFaves