Bug 166015 Refactor designer actions to eclipse command framework
Eclipse command framework provide a more explicit way to manage UI actions contributions, we can take it's advantage to make our actions code more clean and maintainable.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/actions/InsertAction.java
{
	public final static String ID = "org.eclipse.birt.report.designer.ui.views.action.InsertAction";	
	public final static String ABOVE = "above"; 
	public final static String BELOW = "below"; 
	public final static String CURRENT = "current"; 
	private final static String TEXT = Messages.getString( "InsertAction.text" ); 
	private SlotHandle slotHandle;
	private String position;
	private String type = null;
	/**
	 * Create a new insert action with given selection and text at specified
	 * position
	 * 
	 * @param selectedObject
	 *            the selected object,which cannot be null