Thank you for your reply. What I want to achive is actually quite simple: I'd like to pass the variable $SomeVariable to my subrutine to further process it (the code is a simplified version of my real code which is a quite complex GUI with many dynamically generated variables I need to process once the user has "dropped" a file into the widget).
Hardcoding the variable in the subrutine doesn't seem to me viable as the variable is generated outside of it. Using a closure variable - as far as I understand - implies an "answer" from the subrutine (but I may be wrong about what a closure variable is). Inspecting the tk data structures hasn't helped me, unfortunately.
