A menu is the top level menu item, such as "File".
Creation Parameters
- To add a menu to a wxMenuBar
- atom parent
- seqeunce text
- integer style [= 0]
- integer index [= -1]
If omitted, the menu is appended to the existing menus,
or a zero-based index where the menu should be inserted
- To create a popup- or sub-menu
To create a submenu, first create a wxMenu object with no parent,
then create a new wxMenuItem with the menu as the subMenu parameter.
Adds a separator to the end of the menu.
Returns the number of items in the menu.
Inserts a separator at the given position.