How to pass some more parameters with subpanel button?

[nrage]

I need to pass one more parameter to EditView form when clicking a 'Create' button in 'project tasks' subpanel. Currently it passes parent_name, parent_id and some other stuff. I want to pass also the dev_group parameter (the filed i created).
I know that subpanel buttons are instances of SugarWidget class. But I guess that it is possible to add some more parameters to a specific button not changing the class (parent_name and parent_id are in fact as far as i know defined elsewhere).
Does anybody have an idea where I shold apply some changes?

[richardk@idealogical.com]

Interested in knowing this as well.