The item is a CascadeButton, which is usually associated with a pullright menu. The value takes two
additional parameters: a compound string label and a mnemonic. Pullright menus are, ironically, easier to
implement and manage using the not−so−simple menu creation routines described in Chapter 15, Menus.
XmVaSEPARATOR
The item is a Separator and it does not take any additional parameters. Since separators cannot be selected, the
callback routine is not called for this item. Adding a separator does not affect the item count with respect to
the client_data values that are passed to the callback routine for other menu items.
XmVaSINGLE_SEPARATOR
This value is identical to XmVaSEPARATOR.
XmVaDOUBLE_SEPARATOR
This value is identical to XmVaSEPARATOR, except that the separator widget displays a double line instead of
a single line.
XmVaTITLE
The item is a Label that is used to create a title in a menu. It takes one additional parameter: a compound
string label. The item is not selectable, so it does not have a mnemonic associated with it and it does not call
the callback routine. Adding a title does not affect the item count with respect to the client_data values
that are passed to the callback routine for other menu items.
Just as with the CascadeButtons in a MenuBar, the labels associated with each menu item are not the names of
the widgets themselves. The names of the buttons are button_n, where n is the position of the button in the
menu (starting with zero). Similarly, the names of the separators ...