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
*	as well as to all of its children and associated list elements
	 */
	public void initialCheckTreeItem(Object element) {
		treeItemChecked(element, true);
	}
	/**
	 *	Initializes this group's viewers after they have been laid out.
	 */
	protected void initialize() {
		fTreeViewer.setInput(fRoot);
	}
	/**
	 *	Callback that's invoked when the checked status of an item in the list
	 *	is changed by the user. Do not try and update the hierarchy if we are building the
	 *  initial list.
	 */
	protected void listItemChecked(
		Object listElement,
		boolean state,
		boolean updatingFromSelection) {
		List checkedListItems= (List) fCheckedStateStore.get(fCurrentTreeSelection);
		if (state) {
			if (checkedListItems == null) {
				
				
				grayCheckHierarchy(fCurrentTreeSelection);
				checkedListItems= (List) fCheckedStateStore.get(fCurrentTreeSelection);
			}
			checkedListItems.add(listElement);
		} else {