Bug 168888 [Wizards] PageTransition classes may need rename/reorg
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
if (canFlipToNextPage && !canFinish) {
			getShell().setDefaultButton(nextButton);
		} else {
			getShell().setDefaultButton(finishButton);
		}
    }
    /**
     * Update the message line with the page's description.
     * <p>
     * A discription is shown only if there is no message or error message.
     * </p>
     */
    private void updateDescriptionMessage() {
        pageDescription = currentPage.getDescription();
		setMessage(pageDescription);
    }
    /* (non-Javadoc)
     * Method declared on IWizardContainer.
     */
    public void updateMessage() {
        if (currentPage == null) {
			return;
		}
        pageMessage = currentPage.getMessage();
        if (pageMessage != null && currentPage instanceof IMessageProvider) {
			pageMessageType = ((IMessageProvider) currentPage).getMessageType();
		} else {
			pageMessageType = IMessageProvider.NONE;
		}
        if (pageMessage == null) {