IWCGJQTreeView: expand / collapse items

Hello,
is there a way to expand / collapse all items of the treeview?
Kind regards
Ingo Tröger
is there a way to expand / collapse all items of the treeview?
Kind regards
Ingo Tröger
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IWCGJQTreeView.JQTreeViewOptions.Core.ExpandNode(-1,True);
IWCGJQTreeView.JQTreeViewOptions.Core.CollapseNode(-1,True);