How to Create MultiCombo at client side?

[zhangsir199]

Hi everyone, I want to create multiCombo with javascript code dynamically.

var setEditor = function (e) {
    var grdEditor;
    if(e.record.data.f1='dt1')
        grdEditor=new Ext.grid.GridEditor(new Ext.form.TextField());
    else if(e.record.data.f1='dt2')
        grdEditor=new Ext.grid.GridEditor(new Ext.form.MultiCombo()); // Ext.form.MultiCombo() undefined
    e.grid.getColumnModel().setEditor(e.column, grdEditor);
}

There is no problem with aspx code: <ext:MultiCombo>...</ext:MultiCombo>.
But "new Ext.form.MultiCombo()" has a error :missing object.
How could I create it with javascript code?

zhang