jQuery Grid Plugin - jqGrid

Once again a great job with the new 3.3 features! The issue I have is that I used navButtonAdd to add my add/hide culmns button that performs setColumns on cliick. But when the user clicks any of the other buttons, like edit a row, delete a row, the modal dialog for that comes up as well as the Show/Hide dialog for selecting which columns to display/hide. It also happens if I click on for example the edit button and have no row selected, in this case both dialogs also ppear, the one for selecting columns as well as the dialog that informs the user to select a row first. I am not sure if this is a bug. Seee my code exmaples below:

setting jqGrid:

            loadComplete: function()    {
                $(item+'Pager .tbutton').click(function (){$(item).setColumns(); });       
            },
            loadBeforeSend: null,
            search: true,
            searchdata: {},
        .navGrid(item+'Pager',
            {refresh: true, edit: true, add: true, del: true, search: true},
            {}, // edit options
            {}, // add options
            {}, // del options
            {} // search options
        )
        .navButtonAdd(item+'Pager',{caption:"",title:"Select Columns",buttonimg:jQueryImagePath+'/find.gif',position:'last',onClickButton:null}
        );