Programmatically activate a cell

Question

I have a Spark editable datagrid. A user has an ability to add a new row. I want to activate a cell for editing in the new row without clicking on a cell. Is that possible?
Here is my code:
var engine:XMLList = newEngine.copy();
engines.dataProvider.addItemAt(engine, engines.dataProvider.length);
engines.setSelectedIndex(engines.dataProvider.length - 1);     
engines.validateNow();
engines.startItemEditorSession(engines.dataProvider.length - 1, 0);
I still have to click on a cell in the first column to start editing.
Thanks

Answer 1

The code I have provided in my original message is the only code I have:
var engine:XMLList = newEngine.copy();
engine.header_id = consistHeaderModel(model).id;
engines.dataProvider.addItemAt(engine, engines.dataProvider.length);
engines.setSelectedIndex(engines.dataProvider.length - 1);   
engines.validateNow();
engines.setFocus(); // Added this. No difference.
engines.startItemEditorSession(engines.dataProvider.length - 1, 0);
I am running this when a user clicks on column's header. I have a custom header renderer for that. here is some code:
override protected function createChildren() : void
            var addRow:Image = new Image();
            addRow.buttonMode = true;
            addRow.useHandCursor = true;
            addRow.toolTip = toolTipStr;
            addRow.addEventListener("click", clickHandler);
            addRow.source = imgClass;
            addElement(addRow);
            validateDisplayList();
        protected function clickHandler(event:Event):void
            var dynEvent:DynamicEvent = new DynamicEvent(eventToRise, true);
            dispatchEvent(dynEvent);           
More details.
I am using a custom itemEditor for the column:
<s:itemEditor>
     <fx:Component>
     <local:gridTextEditor restrict="^0-9"/>                                   
     </fx:Component>
</s:itemEditor>
where gridTextEditor is the following:
package
    import spark.components.DataGrid;
    import spark.components.TextInput;
    import spark.components.gridClasses.GridItemEditor;
    import spark.components.gridClasses.IGridItemEditor;
    public class gridTextEditor extends GridItemEditor implements IGridItemEditor
        private var valueDisplay:TextInput;
        public var restrict:String;
        public function gridTextEditor()
            //TODO: implement function
            super();
            valueDisplay = new TextInput();
            valueDisplay.setStyle("borderVisible", false);
            valueDisplay.setStyle("unfocusedTextSelectionColor", "#70b2ee");
            //valueDisplay.selectionHighlighting = "always";
            addElement(valueDisplay);
            valueDisplay.x += 4;
            valueDisplay.y += 3;
        override public function prepare():void
            super.prepare();
            valueDisplay.restrict = restrict;
            valueDisplay.width = column.width - 6;
            valueDisplay.selectRange(0, valueDisplay.text.length);
        override public function save():Boolean
            data[column.dataField] = value;
            DataGrid(owner).validateNow();
            return true;
        override public function get value():Object
            return valueDisplay.text;           
        override public function set value(newValue:Object):void
            valueDisplay.text = newValue.toString();