<mx:HDividedBox>
        <mx:FileSystemTree id="tree"
            width="200" height="100%"
            enumerationMode="directoriesOnly"
            change="dataGrid.directory = File(tree.selectedItem);"
            selectedIndex="0"/>
        <mx:FileSystemDataGrid id="dataGrid"
            width="100%" height="100%"
            directory="{new File('C:\\')}"
            extensions="[skdb,skc]"/>
        </mx:HDividedBox>