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
private Map<String, Control> calculationParamsMap = new HashMap<String, Control>( );
	private Map<String, String> calculationParamsValueMap = new HashMap<String, String>( );
	private boolean isStatic = true;
	private ExpressionButton button;
	public void createContent( Composite parent )
	{
		composite = parent;
		( (GridLayout) composite.getLayout( ) ).numColumns = 4;
		lbName = new Label( composite, SWT.NONE );
		lbName.setText( NAME );
		txtName = new Text( composite, SWT.BORDER );
		GridData gd = new GridData( GridData.FILL_HORIZONTAL );
		gd.horizontalSpan = 3;
		gd.widthHint = 250;
		txtName.setLayoutData( gd );
		
		txtName.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				modifyDialogContent( );
				validate( );
			}
		} );
		lbDisplayNameID = new Label( composite, SWT.NONE );
		lbDisplayNameID.setText( DISPLAY_NAME_ID );
		lbDisplayNameID.addTraverseListener( new TraverseListener( ) {
			public void keyTraversed( TraverseEvent e )
			{
				if ( e.detail == SWT.TRAVERSE_MNEMONIC && e.doit )
				{