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/editors/schematic/actions/InsertGroupActionFactory.java
{
		super( editParts, text );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.InsertPositionGroupAction#getPosition()
	 */
	protected int getPosition( )
	{
		if ( isGroup( ) )
		{
			if ( isNotReverse( ) )
			{
				return getCurrentPosition( );
			}
			return getCurrentPosition( ) + 1;
		}
		if ( isNotReverse( ) )
		{
			return POSITION_TOP_LEVEL;
		}
		return POSITION_INNERMOST;
	}
}
class InsertBelowGroupAction extends InsertPositionGroupAction
{
	/**
	 * @param editParts
	 */