How to create an item with sub-items using BarSubItem

This example demonstrates how to create an item with a sub-menu in its popup. To add bar items into BarSubItem, use the Items property:

[XAML]
<dxb:BarSubItem...><dxb:BarSubItem.Items><dxb:BarButtonItem...></dxb:BarSubItem.Items></dxb:BarSubItem>

Since Items is a content property, you can add other items directly into the BarSubItem tag:

[XAML]
<dxb:BarSubItem...><dxb:BarButtonItem.../></dxb:BarSubItem>

If items are defined in another place, it's possible to reference a theme using the ItemLinks property:

[XAML]
<dxb:BarManager>
    <dxb:BarManager.Items>
        <dxb:BarButtonItemName="item1".../>
    </dxb:BarManager.Items>    ...    <dxb:BarSubItem...>
        <dxb:BarSubItem.ItemLinks>
            <dxb:BarButtonItemLinkBarItemName="item1"/>
        </dxb:BarSubItem.ItemLinks>
    </dxb:BarSubItem></dxb:BarManager>