Bug 315281 update copyrights for 3.6
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
.updateChildCount(treePath, currentChildCount);
				}
			} else {
				((ILazyTreeContentProvider) getContentProvider()).updateChildCount(item.getData(), currentChildCount);
			}
		} finally {
			setBusy(oldBusy);
		}
	}
	protected void disassociate(Item item) {
		if (contentProviderIsLazy) {
			
			item.setText(" "); 
		}
		super.disassociate(item);
	}
	protected int doGetColumnCount() {
		return tree.getColumnCount();
	}
	/**
	 * Sets a new selection for this viewer and optionally makes it visible.
	 * <p>
	 * <b>Currently the <code>reveal</code> parameter is not honored because
	 * {@link Tree} does not provide an API to only select an item without
	 * scrolling it into view</b>
	 * </p>
	 *
	 * @param selection
	 *            the new selection
	 * @param reveal