How to make the workflow tasks displayed in custom manners in the homepage in CRM WEB UI?

Hi experts,

the requirement is:

display the workflow tasks in 3 separate views according to the workflow status.

for example, the workflow status like "Draft", "Pending for approval", "Returned" should be listed in three views.

My resolution is:

I created a viewset and 3 views by copying view "GSWFWC/WorkFlow".

My concern is where I can obtain the data(searched out by the system) and make the classification?

I planed to do this in method DO_PREPARE_OUTPUT,but how??

Can anybody suggest?

Thanks in advance.

Jerry