CommandHandler useKeyboardNotification = new CommandHandler()
{
public void onCommand(AppCommand command)
{
MessageDialogLabel label = new MessageDialogLabel();
label.setHtml("Your browser does not allow access to your<br/>" +
"computer's clipboard. As a result you must<br/>" +
"use keyboard shortcuts for:" +
"<br/><br/><table cellpadding=0 cellspacing=0 border=0>" +
makeRow(commands.undoDummy()) +
makeRow(commands.redoDummy()) +