The TreeView_ExpandNode() function expands the specified node in a tree view field.
TreeView_ExpandNode(tree_view_field, node_ID)
• tree_view_field – The tree view field containing the node to be expanded.
• node_ID – A long integer specifying the ID of the node to be expanded.
A boolean indicating whether the node was successfully expanded. True indicates the node was successfully expanded. False indicates the node was already expanded.