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
Point delta = calculatePageSizeDelta(page);
        if (delta.x > 0 || delta.y > 0) {
             
            Shell shell = getShell();
            Point shellSize = shell.getSize();
            setShellSize(shellSize.x + delta.x, shellSize.y + delta.y);
            constrainShellSize();
        }
    }
    /**
     * Computes the correct dialog size for the given wizard and resizes 
     * its shell if nessessary.
     *
     * @param sizingWizard the wizard
     */
    private void updateSizeForWizard(IWizard sizingWizard) {
        Point delta = new Point(0, 0);
        IWizardPage[] pages = sizingWizard.getPages();
        for (int i = 0; i < pages.length; i++) {
            
            Point pageDelta = calculatePageSizeDelta(pages[i]);
            delta.x = Math.max(delta.x, pageDelta.x);
            delta.y = Math.max(delta.y, pageDelta.y);
        }
        if (delta.x > 0 || delta.y > 0) {
             
            Shell shell = getShell();
            Point shellSize = shell.getSize();
            setShellSize(shellSize.x + delta.x, shellSize.y + delta.y);