How to give vaadin component as input to Activiti Bpm 2.0

Hi All,

I think it is not related to vaadin .But if you have any idea about Activiti bpm to integrate vaadin component as input to the Starttask or usertask…

{ex: starttask having the property like( activiti:formkey=“formname”)}.

in formname place i want to give vaadin component .i looked some with jsf as form .but i want vaadin component as a input that to give?

If any one having idea about dis query please post me as early as possible…