code: void createPage1() {
  		Composite composite = new Composite(getContainer(), SWT.NONE);
  		
  		RowLayout layout = new RowLayout();
  		layout.wrap = false;
  		layout.pack = true;
  		layout.justify = true;
  		layout.type = SWT.VERTICAL;
  		layout.marginLeft = 5;
  		layout.marginTop = 5;
  		layout.marginRight = 5;
  		layout.marginBottom = 5;
  		layout.spacing = 0;
  		composite.setLayout(layout);
  		
  		browser = new Browser(composite, SWT.NONE);
  		browser.setLayoutData(new RowData(640, 360));
  
  	
  		Button previewOnGlass = new Button(composite, SWT.NONE);
  		previewOnGlass.setText("#throughglass﻿");
  
  
  		previewOnGlass.addSelectionListener(new SelectionAdapter() {
  			public void widgetSelected(SelectionEvent event) {
  				if(!setClientprovider()) {
  					GoogleLogin.promptToLogIn("Glassmaker");
  				}			
  				if (GoogleLogin.getInstance().isLoggedIn())
  					previewOnGlass();
  			}
  		});
  
  		int index = addPage(composite);
  		setPageText(index, "Preview");
  		
  	}
docs: Creates page 1 of the multi-page editor, which is used to preview the page .