gtk/button_box.go
func (v *ButtonBox) SetChildSecondary(child IWidget, isSecondary bool) {
	C.gtk_button_box_set_child_secondary(v.native(), child.toWidget(), gbool(isSecondary))
}
func (v *ButtonBox) SetChildSecondary(child IWidget, isSecondary bool) {
	C.gtk_button_box_set_child_secondary(v.native(), child.toWidget(), gbool(isSecondary))
}
// SetChildSecondary() is a wrapper around gtk_button_box_set_child_secondary().