Empty line in a combobox in a grid when editing is only 3px high

[torsten.t]

The user shall be able to select an "empty" entry in a combobox. The empty line should have the normal height.
On base of the given Grid Cell editing example (cell-editing.js) I just added a model, a store and a renderer for the Combobox.
The id of the "empty" row will be send to the server.

I just added:

    // Test combobox
    Ext.define('CbModel', {
      extend: 'Ext.data.Model',
      fields: [
                {name:'id', type:'int'},
                {name:'name', type:'string'}    
      ],
    });  
    var storeLight = Ext.create("Ext.data.Store", {
        model: 'CbModel',
        data : [
         {id: '1',    name: 'Shiny'},
         {id: '2', name: 'Rain'},
         // Here you can see the tests which did not work *******************************
         {id: '3', name: ' '},  // shows   when selected
         {id: '4', name: ''},        // row to tiny (arond 3px high)
         {id: '5', name: ' '},        // row to tiny (arond 3px high)
         {id: '6', name: '<br>'}        // shows <br> when selected         
        ] 
    });
    // End Test combobox

and changed the light-column in the grid

            header: 'Light',
            dataIndex: 'light',
            width: 130,
            renderer: function(value) {
              var r = storeLight.getById(value);
              return r ? r.get('name') : 'unknown';
            },            
            editor: new Ext.form.field.ComboBox({
                typeAhead: true,
                triggerAction: 'all',
                selectOnTab: true,
                store: storeLight,
                displayField: 'name',
                valueField: 'id',                
                queryMode: 'local',                
                lazyRender: true,
                listClass: 'x-combo-list-small'
            })

Back to my question: How can I give the user a blank line with a normal height in the editor, which is still "blank" after the user has selected it?

[Stormseeker]

For a regular combobox, we just added some CSS to force the height for the combo items. Should probably work for combobox editors as well.

.x-boundlist-item {
    height    : 20px;
}

[torsten.t]

You nailed it. Thanks Stormseeker