jQuery Grid Plugin - jqGrid

I have had a look at all of the example but I can't seem to find out if it is possible to have the grid already set to editable?

In my last column I want the select dropdown to be display for every row as soon as the grid is populated.

At the moment the closest I can get it by clicking the field and then it enters edit mode.

I did see an example where it worked for a checkbox but setting the same values for the select formatter did not work.

Thanks in advance