Bug 234345 [Viewers] AbstractTreeViewer#getChildren(Widget,Object[]) holds doc that it is experimental
a) Remove the experimental description => Why do we need this method b) Remove the method
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
TreePath treePath = (TreePath) elementOrTreePath;
			if (treePath.getSegmentCount() == 0) {
				return getControl();
			}
			Widget[] candidates = findItems(treePath.getLastSegment());
			for (int i = 0; i < candidates.length; i++) {
				Widget candidate = candidates[i];
				if (!(candidate instanceof Item)) {
					continue;
				}
				if (treePath.equals(getTreePathFromItem((Item) candidate),
						getComparer())) {
					return candidate;
				}
			}
			return null;
		}
		return findItem(elementOrTreePath);
	}
	/**
	 * Recursively expands the subtree rooted at the given widget to the given
	 * level.
	 * <p>
	 * </p>
	 * Note that the default implementation of this method does not call
	 * <code>setRedraw</code>.
	 *
	 * @param widget
	 *            the widget
	 * @param level