Bug 73027 [Dialogs] Buttons are too high
I20040831 Buttons are no longer oval but have a rounded rectangle shape (see first screenshot). The second screenshot shows how buttons using the small system font should look like.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferencePage.java
if (preferenceStore != null)
            return preferenceStore;
        else if (container != null)
            return container.getPreferenceStore();
        return null;
    }
    /**	
     * The preference page implementation of an <code>IPreferencePage</code>
     * method returns whether this preference page is valid. Preference
     * pages are considered valid by default; call <code>setValid(false)</code>
     * to make a page invalid.
     */
    public boolean isValid() {
        return isValid;
    }
    /**
     * Suppresses creation of the standard Default and Apply buttons
     * for this page.
     * <p>
     * Subclasses wishing a preference page wihthout these buttons
     * should call this framework method before the page's control
     * has been created.
     * </p>
     */
    protected void noDefaultAndApplyButton() {
        createDefaultAndApplyButton = false;
    }
    /**
     * The <code>PreferencePage</code> implementation of this 
     * <code>IPreferencePage</code> method returns <code>true</code>