Common UI: How to deactivate another widget?

Thanks for you answer!
I have a CommonUserWidget with a common activatable widget stack.
In menue 1 I create a reference to that widget and then I push menue2 to that stack. (actually there are 3 stacks to layer the menues…)
Another solution might be to access that CommonUserWidget stack and clear it from there but I haven´t been able to figure that out.

This is Menu1 from witch I push menu2 via the widget stack:

This is Menu2 from witch i want to be able to deactivate menue1 from:

Im not familiar with creating child widgets