it looks like what you want here is covered by dynamic spec. Have a look at the dynamic spec section in the Spec booklet (work in progress) https://ci.inria.fr/pharo-contribution/view/Books/job/PharoBookWorkInProgress/lastSuccessfulBuild/artifact/book-result/Spec/ I think that it will answer your question.

On Jan 7, 2016, at 22:36, Offray Vladimir Luna C��rdenas <offray@riseup.net> wrote:

How can I initializeWidgets with some kind of conditions depending on the kind of selection I have done on the tree?

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Johan Fabry - http://pleiad.cl/~jfabry
PLEIAD and RyCh labs - Computer Science Department (DCC) - University of Chile