[Pharo-project] Help with MenuMorph

HI guys I'm trying to fix all the sound interface for 2.0 and I got trapped into MenuMorph. How do I schedule a menu and get its selected value? I have to convert code like the following one. | aMenu sz on | aMenu := MenuMorph new title: ('FFT size (currently {1})' translated format:{fft n}). ((7 to: 10) collect: [:n | 2 raisedTo: n]) do: [:r | aMenu add: r printString action: r]. sz := aMenu popUpInWorld. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ how can I get the selected value? sz ifNil: [^ self]. on := soundInput isRecording. self stop. fft := FFT new: sz. self resetDisplay. on ifTrue: [self start].