Simplicity skin IS missing images

[tdk]

The claim in thread http://forums.smartclient.com/showthread.php?t=15388 that Simplicity works in the Showcase is not quite correct!

Try Buttons -> States and you will see a broken image icon for "[SKIN]/headerIcons/minimize.png".

In my case I'm missing "[SKIN]/headerIcons/mail.png" which my app shows.
I know how to switch skins but I want to give the user the choice of switching to whatever skin they want to. And if they switch to Simplicity it doesn't look good, if icons are missing.

Following is my gwt.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.7.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.7.0/distro-source/core/src/gwt-module.dtd">
<module>
    <inherits name="com.google.gwt.user.User"/>
    <inherits name="com.google.gwt.core.Core"/>
    <inherits name="com.google.gwt.user.History"/>
    <inherits name="com.google.gwt.i18n.I18N"/>
    <inherits name="com.smartgwt.SmartGwtNoScript"/>
    <inherits name="com.smartgwt.tools.SmartGwtTools"/>
    <inherits name="com.smartclient.theme.enterprise.EnterpriseResources"/>
    <inherits name="com.smartclient.theme.enterpriseblue.EnterpriseBlueResources"/>
    <inherits name="com.smartclient.theme.graphite.GraphiteResources"/>
    <inherits name="com.smartclient.theme.simplicity.SimplicityResources"/>
    <inherits name="com.smartclient.theme.fleet.FleetResources"/>
    <inherits name="com.smartclient.theme.silverwave.SilverWaveResources"/>
    <inherits name="com.smartclient.theme.treefrog.TreeFrogResources"/>
    <inherits name="com.smartclient.theme.blackops.BlackOpsResources"/>
    <inherits name="de.ics.continuity.web.Common"/>
</module>

I'm using GWT 2.2.0 and SmartGWT 2.4.