Note: The NO_BACKGROUND, NO_FOCUS, NO_MERGE_PAINTS,
and NO_REDRAW_RESIZE styles are intended for use with Canvas.
They can be used with Composite if you are drawing your own, but their
behavior is undefined if they are used with subclasses of Composite other
Note: The CENTER style, although undefined for composites, has the
same value as EMBEDDED (which is used to embed widgets from other
widget toolkits into SWT). On some operating systems (GTK, Motif), this may cause
the children of this composite to be obscured. The EMBEDDED style
is for use by other widget toolkits and should normally never be used.
This class may be subclassed by custom control implementors
who are building controls that are constructed from aggregates
of other controls.