protected override async void OnViewLoadedAsyncExecute()
{
IsBusy = true;
var users = await _userRegistrationService.GetLookUpsAsync();
SetDataSource(metroComboBox1, users);
treeView1 = await _permissionsManger.OnLoadMenuItems(treeView1);
metroComboBox1.SelectedIndex = -1;
IsBusy = false;
}