Specifies possible actions on collapse of a tree view node, which results in the close of its child tree list.
Assembly: Microsoft.VisualStudio.Shell.Interop (in Microsoft.VisualStudio.Shell.Interop.dll)
Discard this and all its children lists.
Discard children lists. The children lists will also get an OnClose call.
Do not do any list discarding; just collapse the node. This is the default if no value is specified.