code: func (v *ButtonBox) SetChildNonHomogeneous(child IWidget, nonHomogeneous bool) {
  	C.gtk_button_box_set_child_non_homogeneous(v.native(), child.toWidget(), gbool(nonHomogeneous))
  }
docs: // SetChildNonHomogeneous() is a wrapper around gtk_button_box_set_child_non_homogeneous().