code: func (v *AppChooserDialog) SetHeading(heading string) {
  	cstr := C.CString(heading)
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_app_chooser_dialog_set_heading(v.native(), (*C.gchar)(cstr))
  }
docs: // SetHeading() is a wrapper around gtk_app_chooser_dialog_set_heading().