protected override async Task <ITreeNodeContainer> CreateRootNodeAsync()
{
var root = new GoogleDriveRoot();
var myDriveFolder = await _gService.GetMyDriveAsync();
var myDrive = new GoogleMyDrive(myDriveFolder.File);
var teamDrive = new GoogleTeamDrive();
var activityDrive = new GoogleActivityDrive();
var adhocDrive = new GoogleAdhocDrive();
var searchResultDrive = new GoogleSearchResultDrive();
_rootFolder = new GoogleDriveFolder(root, null, GetRootsAsync);
_myDriveFolder = new GoogleDriveFolder(myDrive, _rootFolder, GetFilesAsync);
_teamDriveFolder = new GoogleDriveFolder(teamDrive, _rootFolder, GetTeamDrivesAsync);
_activityFolder = new GoogleDriveFolder(activityDrive, _rootFolder, GetActivityFilesAsync);
_adhocFolder = new GoogleDriveFolder(adhocDrive, _rootFolder, GetAdhocFilesAsync);
_searchResultFolder = new GoogleDriveFolder(searchResultDrive, _rootFolder, GetSearchResultAsync);
return(new TreeNodeContainer(_rootFolder, null, this));
}