Is there a way to call functions of the edit menu programmatically?

I'm trying to implement Escribe spell checker in my application.
Escribe uses a macro that does : {CTRL+A}{CTRL+C} SPELLER
Then SPELLER uses the content of the clipboard to perform the spell check.

This generally works for all field types but curiously, for a memo field in a grid with SPARSE = False, CTRL+A don't work.

Why does "Select-All" works when Sparse = True
and doesn't when Sparse = False ?

As a workaround I'd like to call "Select-All" programmatically but how?
Any suggestions?

Thanks.