DynamicListRootAttributeListNames Property
The property grid allows for each root list item to have a subtree, which have
their own list to be handled independently of the top-most root list. Each EditableItem may declare
itself as the context root item for one or more dynamic lists within the
DynamicListRootAttribute -> ListNames as a new string[]
{
"ListForWhichThisItemIsTheRoot1",
"ListForWhichThisItemIsTheRoot2"
}