Checkboxes widget with command functions and tips when mouse is over the box.
Parent frame.
(vector of strings) Variable names for each checkbox.
(vector of strings) Labels for each checkbox.
Title for the set of checkboxes.
A vector of values ("0" or "1"). Overrides the `default_value`.
(string) Default value ("0" or "1").
A named list of commands (functions) for checkbox. The names must match the values of "boxes".
(function) A default command.
A named list of strings to be used as tips for checkbox. The names must match the values of "boxes".
(string) a default tip.
(logical) Flag if the frame should have a border.
(string) One of "vertical" (default) and "horizontal".
(string) `sticky` option for buttons.
(string) `sticky` option for title (if no border is used).
A named list with fields `frame` (frame with the checkboxes), `var` (tcl/tk variables for each box), and `obj` (tcl/tk objects for each box).