The Bulletin Board is the most basic Manager: a child is 'pinned' onto the bulletin in a specific location until moved. The Bulletin board imposes no layout policy on child widgets.
It may be used for absolute positioning of widgets; it may also be used if complicated positioning is required and C code is going to be written for this purpose.
In Motif, the Bulletin Board widget serves as a basis for widgets such as the Form widget.
In X-Designer, you can use the Layout Editor to specify the X, Y coordinates of any child widgets of a Bulletin Board.
For more information concerning the Bulletin Board widget, see XmBulletinBoard(3X) in the OSF/Motif Programmer's Reference.
HINTS
For more flexible layout, use a Form widget.
The resize behavior of the Bulletin Board is remarkably sensitive to the version of the Motif toolkit. Setting margin width and height to zero can prevent dynamic recalculation of widget and child layout. The implementors of Motif changed their minds several times over this issue: you should be aware that changing margins can have unexpected side effects across platform variants of the toolkit.
See also: