This control allows independently toggling display of each of the
four main branches of the tree. By default, all branches are checked
“on” for display. This is a program setting; it is not saved with the
project. When a branch is not displayed on the tree (unchecked), it
is also not included in tree updates.
Filter control
The edit box accepts strings by which the entire tree will be
filtered. Tree display is reduced to only those tree elements
(plus their “parent” container(s), as present) that match the
string in the field. Clear the field to restore the full tree to
display.
