Conditional Datagrid cell editing

The event handler

private function disableEditing(event:DataGridEvent):void {

    if(event.columnIndex == 1 && event.rowIndex == 0)
    {  
        event.preventDefault(); 
    }
}

The MXML Definition of the datagrid

    <mx:DataGrid id="myGrid" 
                 editable="true" 
                 itemEditBeginning="disableEditing(event)">
                 
                 <!-- definition of columns & such here -->
    </mx:DataGrid>