Bug 96440 Tables laying out 3 times when trying to determine sizes
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferencePage.java
* @return the preference store, or <code>null</code> if none
     */
    protected IPreferenceStore doGetPreferenceStore() {
        return null;
    }
    /**
     * Returns the container of this page.
     *
     * @return the preference page container, or <code>null</code> if this
     *   page has yet to be added to a container
     */
    public IPreferencePageContainer getContainer() {
        return container;
    }
    /**
     * Returns the preference store of this preference page.
     *
     * @return the preference store , or <code>null</code> if none
     */
    public IPreferenceStore getPreferenceStore() {
        if (preferenceStore == null)
            preferenceStore = doGetPreferenceStore();
        if (preferenceStore != null)
            return preferenceStore;
        else if (container != null)
            return container.getPreferenceStore();
        return null;
    }
    /**	
     * The preference page implementation of an <code>IPreferencePage</code>