In ExtJs 3.3.1, how can I show a ComboBox drop down without click in EditorGrid?

Question

I am using ExtJs 3.3.1.

Within an EditorGrid, my "editable" column has a ComboBox as its editor. How can I have the ComboBox always showing for each row? Meaning, the user would not have to click on a cell to know there is a ComboBox there. Currently, I have clicksToEdit set to 1, but I wish I could set this to 0 (I tried that).

See some of my code below to see my current configuration.

var combo = new Ext.form.ComboBox({
    typeAhead: true,
    triggerAction: 'all',
    lazyRender: true,
    mode: 'local',
    store: new Ext.data.ArrayStore({
        id: 0,
        fields: [
            'statusId',
            'displayText'],
        data: data
    }),
    valueField: 'statusId',
    displayField: 'displayText'
});

var cm = new Ext.grid.ColumnModel({
    columns: [{
        id: 'orderId',
        header: 'ID',
        dataIndex: 'id',
        width: 50
    }, {
        header: 'Status',
        dataIndex: 'status',
        width: 130,
        editor: (data.length == 1) ? null : combo,
        renderer: Ext.util.Format.comboRenderer(combo)
    }, {
        id: 'orderSummary',
        header: 'Summary',
        dataIndex: 'summary',
        renderer: this.renderSummary
    }]
});

var orderGrid = new Ext.grid.EditorGridPanel({
    store: this.getOrderStore(),
    cm: cm,
    autoExpandColumn: 'orderSummary',
    clicksToEdit: 1
});