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
return;
								}
							}
						}
					}
				}
				catch ( BirtException e )
				{
					
				}
			}
			if ( isTimePeriod( ) )
			{
				ITimeFunction timeFunction = getTimeFunctionByIndex( calculationType.getSelectionIndex( ) );
				if ( timeFunction != null )
				{
					List<IArgumentInfo> infos = timeFunction.getArguments( );
					for ( int i = 0; i < infos.size( ); i++ )
					{
						String paramValue = getControlValue( calculationParamsMap.get( infos.get( i )
								.getName( ) ) );
						if ( paramValue == null
								|| paramValue.trim( ).equals( "" ) && !infos.get( i ).isOptional( ) ) 
						{
							dialog.setCanFinish( false );
							return;
						}
					}
					String dimensionName = getTimeDimsionName( );
					if ( !isUseDimension( dimensionName )