Bug 5571 JAR Packager: Reveal first checked project
If the list of projects in the JAR Packager is long it is possible that the shown projects are not checked even though there are checked projects (due to current selection). ==> reveal the first checked project.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/CheckboxTreeAndListGroup.java
* 
	 * @return the table used to show the list
	 */
	public Table getTable() {
		return fListViewer.getTable();
	}
	/**
	 * Gets the tree that displays the list for a folder
	 * 
	 * @return the tree used to show the folders
	 */
	public Tree getTree() {
		return fTreeViewer.getTree();
	}
	/**
	 * Adds the given filter to the tree viewer and
	 * triggers refiltering and resorting of the elements.
	 *
	 * @param filter a viewer filter
	 */
	public void addTreeFilter(ViewerFilter filter) {
		fTreeViewer.addFilter(filter);
	}
	/**
	 * Adds the given filter to the list viewer and
	 * triggers refiltering and resorting of the elements.
	 *
	 * @param filter a viewer filter
	 */
	public void addListFilter(ViewerFilter filter) {