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
{
				handleFunctionSelectEvent( );
				modifyDialogContent( );
				validate( );
			}
		} );
		paramsComposite = new Composite( composite, SWT.NONE );
		GridData gridData = new GridData( GridData.FILL_HORIZONTAL );
		gridData.horizontalSpan = 4;
		gridData.exclude = true;
		paramsComposite.setLayoutData( gridData );
		GridLayout layout = new GridLayout( );
		
		layout.marginWidth = layout.marginHeight = 0;
		layout.numColumns = 4;
		Layout parentLayout = paramsComposite.getParent( ).getLayout( );
		if ( parentLayout instanceof GridLayout )
			layout.horizontalSpacing = ( (GridLayout) parentLayout ).horizontalSpacing;
		paramsComposite.setLayout( layout );
		new Label( composite, SWT.NONE ).setText( FILTER_CONDITION );
		txtFilter = new Text( composite, SWT.BORDER | SWT.WRAP );
		gridData = new GridData( GridData.FILL_HORIZONTAL );
		gridData.horizontalSpan = 2;
		gridData.heightHint = txtFilter.computeSize( SWT.DEFAULT, SWT.DEFAULT ).y
				- txtFilter.getBorderWidth( )
				* 2;
		txtFilter.setLayoutData( gridData );
		txtFilter.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{