Extjs 4 grouped columns header dynamic text modification

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I have the following grouped headers grid :

var lestore =  Ext.create('Ext.data.Store', {
       proxy: {
                type: 'memory'
                },
        autoDestroy: true,
        data:objstore
    });

 thegrid = Ext.create('Ext.grid.Panel', {
        store: lestore,
        columnLines: true,
        columns: [{text:'date'},{text:'TV',columns:{text:'400',columns:[{text:'tt1'},{text:'tt2'}]}]  ,
        title:'my title'  ,
        selModel: {
            selType: 'cellmodel'
        },
        renderTo: 'gridmpoff',
            plugins: [Ext.create('Ext.grid.plugin.CellEditing', {clicksToEdit: 1}
                )
                 ],

        listeners: {'edit': function(editor,e) {updtitle(editor,e);}
        },
        viewConfig: {
            stripeRows: true
        },

    });

I need to change the columns texts (tt1,tt2 etc) after the grid creation, without changing the header grouping.

I Tried modifying the columns property, but that doesn't help, only thing that worked so far is a reconfigure which messes with the editor.

Please advice

asked 37 secs ago

Gar

287