The New command constructs a new context menu to which entries, queries, and entry generators can be added using the Entries[Add], Entries[AddMultiple], Queries[Add], and EntryGenerators[Add] commands. You can replace the current context menu with the new context menu using the Install command.

with(ContextMenu):

Replace the default context menu with a new context menu.

newCM := New();

newCM[Entries][Add]("Multiply by 2", "2*%EXPR", numeric);

newCM[Queries][Add]("Divisible by 2", proc(p) evalb(p mod 2 = 0) end proc);

newCM[Entries][Add]("Divide by 2", "%EXPR/2", integer, 'test'="Divisible by 2");

Install(newCM);