Create Workitem from client-app

I have a Windows-app written with VS 2012 (VB). This program (client) should now also create a new workitems (TFS 2013).

How can I perform this?

• is there any pre-defined dialog I can use?
• should I design my own form, or is there a possibilty to open the dialog from TeamExplorer like TeamCompanion does?
• the WorkItemFormControl Class is obsolete for VS2012.
• Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItem has no dialog...

Tx

Patrick