jQuery Grid Plugin - jqGrid

I am dynamically setting the select options for a column in my grid.  It seems to work only if the add/edit dialog has not already been created. 

eg. 

  jQuery("#grida").setColProp('playerid',{editoptions:{value: playerSelect} } );
  jQuery("#grida").trigger("reloadGrid");

 Add a row -> playerid select box has correct values

 modify playerSelect

 jQuery("#grida").setColProp('playerid',{editoptions:{value: playerSelect} } );
  jQuery("#grida").trigger("reloadGrid");

 Add a row -> playerid select box does not have updated values

Is there a way to destory the add/edit dialog so that the selection box will be recreated each time a row is added/edited?