Comment #7 on issue 947 by chisvasi...@gmail.com: TextPresentations should support setting the selectionInterval on creation http://code.google.com/p/moose-technology/issues/detail?id=947
Ok. Now it's more clear :) I guess the best place to do it would be GLMPane>>presentations: aCompositePresentation self notingPresentationChangeDo: [ .... presentations initializePorts ].
Doing this in GLMPresentation>>pane: would be an overkill.