Bug 119216 Regression: Group can't be added in layout editor.
Description: Group can't be added in layout editor. Steps to reproduce: 1. Add a table. 2. Right click on the table and find that "insert group" is grayed out.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/actions/InsertGroupActionFactory.java
{
	private static InsertPositionGroupAction[] instances = new InsertPositionGroupAction[]{
			new InsertAboveGroupAction( null, Messages
					.getString( "InsertPositionGroupAction.Label.Above" ) ), 
			new InsertBelowGroupAction( null, Messages
					.getString( "InsertPositionGroupAction.Label.Below" ) ), 
	
	
	
	};
	/**
	 * Creates a insert group action, given slotid and selection list.
	 * 
	 * @param slotID
	 *            slotid
	 * @param selection
	 *            selected editparts
	 * @return action
	 */
	public static Action createInsertGroupAction( int slotID, List selection )
	{
		if ( slotID == TableHandle.HEADER_SLOT
				|| slotID == ListHandle.HEADER_SLOT )
		{
			return new InsertAboveGroupAction( selection, Messages
					.getString( "InsertGroupActionFactory.label.insertGroup" ) ); 
		}
		else if ( slotID == TableHandle.DETAIL_SLOT
				|| slotID == ListHandle.DETAIL_SLOT )
		{