Bug 390669 [Accessibility]Press 'Tab' doesn't focus on the next report item when adding relative period aggregation.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
CubeHandle cubeHandle = xtabHandle.getCube( );
			if ( cubeHandle != null )
			{
				List children = cubeHandle.getContents( CubeHandle.MEASURE_GROUPS_PROP );
				for ( int i = 0; i < children.size( ); i++ )
				{
					MeasureGroupHandle group = (MeasureGroupHandle) children.get( i );
					List measreHandles = group.getContents( MeasureGroupHandle.MEASURES_PROP );
					for ( int j = 0; j < measreHandles.size( ); j++ )
					{
						MeasureHandle measure = (MeasureHandle) measreHandles.get( j );
						String str = DEUtil.getExpression( measure );
						if ( !measures.contains( str ) )
						{
							measures.add( str );
						}
					}
				}
			}
		}
		catch ( ExtendedElementException e )
		{
		}
		return measures;
	}
	private List<String> getDatas( )
	{
		List<String> datas = new ArrayList<String>( );