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
btnRemoveDisplayNameID.setToolTipText( Messages.getString( "ResourceKeyDescriptor.button.reset.tooltip" ) ); 
		btnRemoveDisplayNameID.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent event )
			{
				txtDisplayNameID.setText( EMPTY_STRING );
				txtDisplayName.setText( EMPTY_STRING );
				updateRemoveBtnState( );
			}
		} );
		new Label( composite, SWT.NONE ).setText( DISPLAY_NAME );
		txtDisplayName = new Text( composite, SWT.BORDER );
		gd = new GridData( GridData.FILL_HORIZONTAL );
		gd.horizontalSpan = 3;
		txtDisplayName.setLayoutData( gd );
		txtDisplayName.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				modifyDialogContent( );
				validate( );
			}
		} );
		
		new Label( composite, SWT.NONE ).setText( DATA_TYPE );
		cmbType = new Combo( composite, SWT.BORDER | SWT.READ_ONLY );
		cmbType.setLayoutData( gd );
		cmbType.setVisibleItemCount( 30 );
		cmbType.addSelectionListener( new SelectionListener( ) {
			public void widgetDefaultSelected( SelectionEvent arg0 )
			{
				validate( );