Bug 130094 [regression] cannot edit group in Cheat Sheets
steps to reproduce: - create a report using Grouped Listing template - switch to Cheat Sheets, start/restart the tutorial - follow the steps to 1) create data source; 2) create data set; 3) bind the data to the table; and 4) edit the group expected behavior: - group dialog should be displayed actual behavior: - error message displayed. please refer to the attached image for detail
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/DefaultNodeProvider.java
public String getNodeTooltip( Object model )
	{
		return null;
	}
	/**
	 * Gets the icon name for the given model. The default implementation does
	 * nothing.The subclasses may override it if necessary
	 * 
	 * @param model
	 *            the model of the node
	 * 
	 * @return Returns the icon name for the model,or null if no proper one
	 *         available for the given model
	 */
	public String getIconName( Object model )
	{
		return null;
	}
	protected Object[] getChildrenBySlotHandle( SlotHandle slotHandle )
	{
		ArrayList list = new ArrayList( );
		Iterator itor = slotHandle.iterator( );
		while ( itor.hasNext( ) )
		{
			Object obj = itor.next( );
			if ( obj instanceof DesignElementHandle )
			{
				DesignElementHandle eleHandle = (DesignElementHandle) obj;
				list.add( eleHandle );
			}