Trying to refresh mashup

The above general request grid is populated using a collection widget... now when clicked on
reopen button, a pop-up window will opened like below.

On close of this pop-up window I would like to
refresh the grid.
I tried by binding the "windowClosed" event of the navigate function to refresh mashup in the collection widget mashup but the grid is not getting refreshed.....

Would like to know if their is an alternative way to refresh the grid.

