Hi, The way to do this is to create transmissions from custom ports, and to populate those from the actions. Here is an example: composer := GLMCompositePresentation new. composer tabulator with: [:t | t column: #index; column: [:c | c row: #recepient1; row: #recepient2]. t transmit to: #index; andShow: [:a | a list selectionAct: [:list | (list pane port: #custom1) value: list selection ] on: $1 entitled: 'To recepient 1'; selectionPopulate: #custom2 on: $2 entitled: 'To recepient 2' with: [:list | list selection ] ]. t transmit from: #index port: #custom1; to: #recepient1; andShow: [:a | a text title: 'Recepient 1']. t transmit from: #index port: #custom2; to: #recepient2; andShow: [:a | a text title: 'Recepient 2']. ]. composer openOn: ($a to: $z) In this example, I use two ways to populate a custom port: - Using the default API: selectionAct: [:list | (list pane port: #custom1) value: list selection ] on: $1 entitled: 'To recepient 1' - Using the shortcut API (the same as above, only with slightly nicer method names): selectionPopulate: #custom2 on: $2 entitled: 'To recepient 2' with: [:list | list selection ] ] Cheers, Doru On Jan 19, 2013, at 11:21 AM, Nicolas Anquetil <Nicolas.Anquetil(a)inria.fr> wrote: -- www.tudorgirba.com "We are all great at making mistakes."