private void DisplayChildsFoldersAsyncBegin(TreeNode node)
{
var folderId = (node.Tag as FileFolder).id;
var taskScheduler = TaskScheduler.FromCurrentSynchronizationContext();
var task = Task <IList <FileFolder> > .Factory.StartNew(() => DokuFlexService.GetFilesFolders(_ticket, _currentGroup.id, folderId));
task.ContinueWith(t => DisplayChildsFoldersAsyncEnd(t.Result, node), taskScheduler);
task.ContinueWith(t => TaskAsyncExceptionHandle(t.Exception),
new CancellationTokenSource().Token, TaskContinuationOptions.OnlyOnFaulted,
taskScheduler);
}