||ResultTrees are an implementation of the
Tree API, used to handle hierarchical
data, whose nodes are DataSource records which are retrieved from a server.
||A Tree is a data model representing a set of objects linked into a hierarchy.
||The Smart GWT system supports hierarchical data (also referred to as tree data due to its "branching" organization)
Tree class, which manipulates hierarchical data sets
the TreeGrid widget class, which extends the ListGrid class to visually present tree data in an
||An object literal with a particular set of properties used to configure the display of and interaction with the columns
||Every node in the tree is represented by a TreeNode object which is an object literal with a set of properties that
configure the node.