jQuery Grid Plugin - jqGrid

/var ActionsWidth = manageWorkWidth-(ActionNameWidth+CompleteWidth+80);
            $('#jQGridActionsTable@(Model.RowID)').jqGrid({
                datatype: 'local',
                data: JSONData,
                colNames: ['Task Actions' ,'Description', ''],
                colModel: [
                            { name: 'ActionName', index: 'ActionName', width: 418, searchoptions: { sopt: ['cn', 'nc', 'bw', 'ew', 'eq', 'ne'] }, formatter: actionCellFormatter, formatoptions: { cellType: 'action' } },
                            //{ name: 'Complete', index: 'Complete', width: CompleteWidth, search: false, sortable: false, title: false, align: 'center', formatter: actionCellFormatter, formatoptions: { cellType: 'complete' }  },
                            //{ name: 'Actions', index: 'Actions', width: ActionsWidth, search: false, sortable: false },
                            {name:'ActionDescription', index:'ActionDescription', width:1000, sorttype:'text', sortable: true,

cellattr: function (rowId, val, rawObject, cm, rdata) {

return 'title="'+rawObject.ActionDescription +'"',

     
                             searchoptions: { sopt: ['cn', 'nc', 'bw', 'ew', 'eq', 'ne'] }},
                            { name: 'ActionId', index: 'ActionId', hidden: true }
                            
                ],
                loadonce: true,
                rowNum: 500,
                //rowList: [15, 30, 45],
                //pager: '#jQGridActionsTablePager@(Model.RowID)',
                viewrecords: true,
                rowNum: 10000,
                autowidth: false,
                height: '100%',
                minheight: '50px',
                shrinkToFit: true,
                altRows: true,
                
                gridview: true,
                subGrid: true,
                altclass: 'JQGrid_AlternateRow',
                subGridOptions: { openicon: 'noBgImg' },
                subGridRowExpanded: ActionSubGridRowExpanded, 
                
                beforeSelectRow: function (rowid, e) { OnBeforeSelectRow('jQGridActionsTable@(Model.RowID)', rowid, e); },
                loadComplete: function () { jQuery("#jQGridActionsTable@(Model.RowID)").hideCol('subgrid'); },
                ignoreCase: true
            });

I want to increase the width as my column text. 
My column value in database is 1000 characters but tooltip is showing only 300 characters , rest truncated