Buttons
The following buttons are in the tool bar:

- Exits Treeview without further ado

- Pops up a file browser which allows you to enter a new file or directory
into the tree

- Displays the Details panel to the right of the Tree panel (default)

- Displays the Details panel below the Tree panel

- Displays only the Tree panel with no Details panel

- Collapses the selected node, so its children are no longer visible
(same as clicking on the handle of an expanded node)

- Expands the selected node, so its children are no longer visible
(same as clicking on the handle of a collapsed node)

- Recursively collapses the selected node.
Its children, and its childrens' children, and their children...
are all closed.

- Recursively expands the selected node.
The selected node is expanded, and all its children, and all its
childrens' children... This enables you to see the entire contents
of a given node. If performed on a node containing a lot of data,
e.g. the top of a large directory structure, it may take a long
time to complete.

- Replaces the selected node with its parent.
You can walk up the hierarchy tree inserting nodes above the current
one using this button.
It is only available for a node at the top level of the tree.

- Copies the selected node to the top level of the tree.
You can assemble a set of nodes of interest at the same level in
the tree using this button and the ones listed above and below.

- Reloads the selected node.
The selected node is refreshed from its original data, so for instance
if a directory node is selected this will cause the directory to be
re-read so that any new/deleted files are taken account of.
A reload has the effect of (recursively) collapsing the node in
question.

- Deletes the selected top-level node from the tree.

- Adds a new node to the top of the tree containing various types of
test data. Investigating this node is a good way to find out about
Treeview's capabilities.

- Displays Help information in the Details panel.
This has the side-effect of deselecting any selected node.