Ext technology + Grid + HyperLink column...

Hi,
I built an ascx that contains a grid.
I need to add a column that the values inside will be links.
The column is :
 {name: 'Title', type: 'string'}  -----> instead of string, somthing like "URL", or "HyperLink"
This doesn't work, so how can it be done?
Thanks
(the code is below...)

<script language="javascript">
Ext.onReady(function(){
 
    var record = Ext.data.Record.create([
        {name: 'RequestId', type: 'float'},
        {name: 'Id', type: 'string'},
        {name: 'Title', type: 'string'}  ***********HERE I NEED TO CHANGE TO HYPERLINK-TEXT/URL
    ]);    
        
    var xmlStore = new Ext.data.Store({            
        url     : "Services/ExtService.aspx?serviceMethod=GetData",
        reader  : new Ext.data.XmlReader({
            record      : Suppliers, 
            totalRecords: "results"}, record
        )
    }); 
    var pagingBar = new Ext.PagingToolbar({
        pageSize    : 10,
        displayInfo : true,
        displayMsg  : '',
        store       : xmlStore
    });
 
    xmlStore.load();
 
    var sm = new Ext.grid.RowSelectionModel({
        singleSelect: true,
        listeners: {
            rowselect: function(sm, row, rec) {
                  }
        }
    });
    
    var reportsGrid = new Ext.grid.GridPanel({
        cm : new Ext.grid.ColumnModel([
            expander,
            {RequestID: 'RequestId', dataIndex: 'RequestorId', hidden: true},
            {header: 'a',sortable: true, dataIndex: 'Id'},
            {header: 'b',sortable: true, dataIndex: 'Title'}                
        ]),
        plugins             : expander,
        collapsible         : false,
        animCollapse        : false,
        sm                  : sm,
        enableHdMenu        : false,
        enableColumnResize  : false,
        store               : xmlStore,
        height              : 400,
        width               : 850,
        viewConfig          : {forceFit : true, scrollOffset:2},
        autoExpandColumn    : 'SecondarySubject',
        frame               : true,
        title               :'results',
        bbar                : pagingBar,
        tbar:[
        {text:,'show', tooltip:'show', tooltipType: 'title'}, 
        {text:'back', handler: back, tooltip:'new search', tooltipType: 'title'}
        ]
    });
 
    reportsGrid.render('grid-results');    
 
 });
</script>

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