Bug 32254 [Viewers] AbstractTreeViewer uses HashSet to remember expansion state
I20030216 The custom hash table should be used instead. Otherwise expansion state may be lost due to a different equals implementation of the element and the IElementComparer.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CheckboxTableViewer.java
* no sorter, and no filters.
 * <p>
 * This is equivalent to calling <code>new CheckboxTableViewer(parent, SWT.BORDER)</code>.
 * See that constructor for more details.
 * </p>
 *
 * @param parent the parent control
 * 
 * @deprecated use newCheckList(Composite, int) or new CheckboxTableViewer(Table)
 *   instead (see below for details)
 */
public CheckboxTableViewer(Composite parent) {
	this(parent, SWT.BORDER);
}
/**
 * Creates a table viewer on a newly-created table control under the given parent.
 * The table control is created using the given SWT style bits, plus the 
 * <code>SWT.CHECK</code> style bit.
 * The table has one column. 
 * The viewer has no input, no content provider, a default label provider, 
 * no sorter, and no filters.
 * <p>
 * This also adds a <code>TableColumn</code> for the single column, 
 * and sets a <code>TableLayout</code> on the table which sizes the column to fill 
 * the table for its initial sizing, but does nothing on subsequent resizes.
 * </p>
 * <p>
 * If the caller just needs to show a single column with no header,
 * it is preferable to use the <code>newCheckList</code> factory method instead,
 * since SWT properly handles the initial sizing and subsequent resizes in this case.