Add callback function in panel button

[totocaca123]

When I create a button in panel, I would like to associate a function when user push button (C script, python function...). I can only associate a signal to button.

Moreover the toolbox elements should be classified (input controls, display...)

[freshhope]

Currently you can associate a system var and implement an on change event with this var

[freshhope]

classification will be added

[freshhope]

Please download the latest version, custom controls also supported