ColumnExpanded

ColumnExpanded is used to set the ID of the column, which contains Boolean values describing whether the node should be initially collapsed (FALSE) or expanded (TRUE).

This property requires a special column in the tree table and a special element in the program records:

In the example above, we specified the first and the fourth node as expanded (1 or TRUE). These are the top-level nodes. Other nodes that have children will be initially collapsed: