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
}
				public void widgetSelected( SelectionEvent arg0 )
				{
					handleTimeDimensionSelectEvent( );
					modifyDialogContent( );
					validate( );
				}
			} );
			createDataSelection( composite );
		}
		createMessageSection( composite );
		gd = new GridData( GridData.FILL_BOTH );
		composite.setLayoutData( gd );
		setContentSize( composite );
	}
	private void createDataSelection( Composite composite )
	{
		Label referDataLabel = new Label( composite, SWT.NONE );
		referDataLabel.setText( Messages.getString( "CrosstabBindingDialogHelper.referencedate.label" ) ); 
		GridData gd = new GridData( );
		gd.verticalAlignment = SWT.BEGINNING;
		referDataLabel.setLayoutData( gd );
		Composite radioContainer = new Composite( composite, SWT.NONE );
		GridLayout layout = new GridLayout( );
		gd = new GridData( GridData.FILL_HORIZONTAL );
		gd.horizontalSpan = 3;
		radioContainer.setLayoutData( gd );
		layout = new GridLayout( );
		layout.marginWidth = layout.marginHeight = 0;
		layout.numColumns = 2;