Bug 182190 [StatusHandling] [Wizards] getControl assert on wizard page has no message
M6 If you forget to set the control on your wizard page our assert gives no feedback. We need an error message.
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
* Method declared on Window.
     */
    protected void configureShell(Shell newShell) {
        super.configureShell(newShell);
        
        newShell.addHelpListener(new HelpListener() {
            public void helpRequested(HelpEvent event) {
                
                if (currentPage != null) {
                    currentPage.performHelp();
                }
            }
        });
    }
    /**
     * Creates the buttons for this dialog's button bar.
     * <p>
     * The <code>WizardDialog</code> implementation of this framework method
     * prevents the parent composite's columns from being made equal width in
     * order to remove the margin between the Back and Next buttons.
     * </p>
     *
     * @param parent the parent composite to contain the buttons
     */
    protected void createButtonsForButtonBar(Composite parent) {
        ((GridLayout) parent.getLayout()).makeColumnsEqualWidth = false;
        if (wizard.isHelpAvailable()) {
            helpButton = createButton(parent, IDialogConstants.HELP_ID,
                    IDialogConstants.HELP_LABEL, false);
        }