Bug 238299 [Viewers] Collapse All before expanding class/array suppresses display of all but first child node
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
path = new TreePath(new Object[] { parent });
						}
					}
					Object[] result = tpcp.getChildren(path);
					if (result != null) {
						return result;
					}
				} else if (cp instanceof ITreeContentProvider) {
					ITreeContentProvider tcp = (ITreeContentProvider) cp;
					Object[] result = tcp.getChildren(parent);
					if (result != null) {
						return result;
					}
				}
			}
			return new Object[0];
		} finally {
			setBusy(oldBusy);
		}
	}
	/**
	 * Returns all selected items for the given SWT control.
	 *
	 * @param control
	 *            the control
	 * @return the list of selected items
	 */
	protected abstract Item[] getSelection(Control control);
	/*
	 * (non-Javadoc)