For local Trees, that is, Trees that don't use load on demand, Smart GWT supports setting
up the Tree structure by setting properties such as "childrenProperty", directly on data
nodes. This allows for simpler, faster structures for many common tree uses, but can create
confusion if nodes need to be shared across Trees.
using one node in two places in one Tree
To do this, either clone the shared node like so:
or place the shared data in a shared subobject instead.
sharing nodes or subtrees across Trees
Individual nodes within differing tree structures can be shared by two Trees only if
different values in each Tree.
As a special case of this, two Trees can maintain different open state across a single
read-only structure as long as just "openProperty" has a different value in each Tree.