Providing Overlay for Group task 

what is Done
After a Group task is created 
1. Only a Single task is listed in the all task list with (Group Task ) having attached with its status
2. As being the group task this task cannot be updated so no Update button is provided for it
3. when a user clicks on this listing of group task a overlay pops up showing all the list of tasks assigned to every one; so this facility is basically provided to see what is the status of all the tasks assigned to different assigness