The EntryGenerators[Get] command returns the procedure or list associated with the entry generator with the index Name.  This can be used to examine the entry generator.  To obtain a list of entry generators available in the context menu module, use the EntryGenerators[List] command.

The Name parameter is the index of the desired entry generator in the 'EntryGenerators' table.

with(ContextMenu[CurrentContext]):

Get the procedure associated with the EntryGenerator named "Variables".

q := EntryGenerators[Get]("Variables");