How to add buttons in UWL iview?

Hi,

I have one work item in my UWL inbox in portal sand box and dev.

In sand box, I can see many buttons like approve, reject, changes made...including Resubmit, Forward and Cancel Assignment.

But in Dev I can only see Resubmit, Forward and Cancel Assignment buttons.

How to add the other buttons in UWL iview?

Thanks

Sundar