Filtering with variables

[bfether]

Is there a way to filter a container with a variable?

I want to sort a container by the first letter of the item, based on the selection made in a tabbed button (such as the letter A). This script won't work:

on menuPick tSelection
filter tSort with "[tSelection]*"
end menuPick


TIA...

Best regards,

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Ben C. Fetherston, Jr.