status.i4.v = menu_bar_dncase_entry_c(window_id.i2.v, field.i4.v)

	This routine will convert the label for the requested field to
	all lower case characters.

	window_id	ID of desired window
	field		field number to change (starting at 1)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid window ID
	CBS_NO_SUCH		no menu bar is present or no such field

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	menu_bar_upcase_entry_c, menu_bar_change_entry_c, menu_bar_create,
	window_menu_bar_create_c, menu_bar_min_width_c

	C/C++ usage:

	short	window_id = WMNGR_BACKGROUND;
	int	status;
	int	field = 1;

	status = menu_bar_dncase_entry_c(window_id,field);