"Extending" a palette (i.e., one that you make yourself, not one
provided by someone else) encapsulates four areas—the menu items in
the palette's contextual menu, a category's contextual menu, and an
item's contextual menu. But, also, the Palette Manager itself
(under the Tools menu or by right-clicking in the palette, a
category, or item) can be extended, by adding additional buttons to
it. Each palette has its own manager, which requires zero
programming on your part,...