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Sets height of the title bar in a map container/agent map icon, in map units.
For a (selected) container - a note or agent - a splitter resize mouse icon is shown when the mouse is over the boundary of the title area and the map viewport; click and drag (hand icon) the mouse up or down to alter the height of the title area.
The default value of 0 (or a set value of 0) allows the icon to use Tinderbox's normal auto-resizing where the title area grows as the overall icon area does.
If $TitleHeight is set to other than zero, then resizing the overall size of the container has no effect on the height of the title area.
To 'hide' the viewport area of a container, set the $TitleHeight to equal $Height. This makes the map icon look like a normal note except the two bottom corners (note) or top corners (agent) are rounded. While the viewport is hidden, it is not possible to double-click drill down but its shortcut (Cmd+Opt+Return) will work.