Bug 208055 [Markers] Need a sorting method for the markers view
As there is currently no accessible way to change sort order or direction. A menu should be enough.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/ExtendedMarkersView.java
* 
	 * @see org.eclipse.ui.part.ViewPart#saveState(org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento memento) {
		super.saveState(memento);
		memento.putString(TAG_GENERATOR, builder.generator.getId());
		builder.saveState(memento);
	}
	/**
	 * Select all of the elements in the receiver.
	 */
	void selectAll() {
		viewer.getTree().selectAll();
	}
	/**
	 * Set the category group for the receiver.
	 * 
	 * @param group
	 */
	void setCategoryGroup(MarkerGroup group) {
		categoriesToExpand.clear();
		builder.setCategoryGroup(group);
	}
	/**
	 * Set the content generator for the receiver.
	 * 
	 * @param generator
	 */
	void setContentGenerator(MarkerContentGenerator generator) {
		viewer.setSelection(new StructuredSelection());