private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            ManagementViewModel vm = DataContext as ManagementViewModel;

            if (vm.DealerAccountList == null)
            {
                vm.GetDealerListExecute( );
            }
        }
 void dataPage_PageChanged(object sender, CustomControl.PageChangedEventArgs args)
 {
     vm.GetDealerListExecute();
 }