menu_bar_change_entry_c

	status.i4.v = menu_bar_change_entry_c(window_id.i2.v, field.i4.v,
					      text.i1a.r)

	This routine will replace the label for the requested field with
	the passed text.

	window_id	ID of desired window
	field		field number to change (starting at 1)
	text		null terminated string containing the new menu bar
			field label

	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_dncase_entry_c, menu_bar_upcase_entry_c, menu_bar_create,
	window_menu_bar_create_c, menu_bar_min_width_c

	C/C++ usage:

	static const char	text[] = "New text";
	short	window_id = WMNGR_BACKGROUND;
	int	status;
	int	field = 1;

	status = menu_bar_change_entry_c(window_id,field,text);