How to replace "Call SET_IMAGE(NUMERO) From GESECRAN" in V12 ?

Hello Everyone, 

I am migrating some classic modules from V7 to V12. These modules use "Call SET_IMAGE(NUMERO) From GESECRAN" to add an icon on the rigth toolbar, next to the refresh, print, clip,... icons. 

In V12, this call does not seem to work anymore. How can I manage to produce a similar user interface on v12 ? I couldn't get any hint on any available ressource. 

Thanks!