Fieldset together with fields mapping offers a great facility for form fields layout. I declared some fieldsets nested within the main form which was itself declared in one formcollection together with some other top-level forms. When I tried to activate the dialog from nested fieldset's field, I found the specified induce_open path didn't work: something like main_form.nested_fieldset.activator. Does the path syntax as applied to induce_open support nested fieldset's activator?