Problem with pespectives (or with me)

i added this in nxthemes-setup :
<cell>
<!-- tree view -->
<fragment type="generic fragment" perspectives="default" />
<!-- clip board -->
<fragment type="generic fragment" perspectives="default" />
<!-- calendar -->
<fragment type="generic fragment" perspectives="view_calendar" />
</cell>
....
<widget element="page/section[2]/cell[1]/fragment[3]">
<view>nuxeo5 calendar actions</view>
</widget>

and this on ThemesExtension :
<view name="nuxeo5 calendar actions">
<format-type>widget</format-type>
<class>org.nuxeo.theme.jsf.views.JSFView</class>
<template>incl/user_calendar.xhtml</template>
<resource>scriptaculous.js</resource>
</view>
...
<view id="/view_calendar.xhtml">
<perspective>view_calendar</perspective>
</view>
...
<!-- perspectives -->
<extension target="org.nuxeo.theme.services.ThemeService"
point="perspectives">
<perspective name="view_calendar">
<title>Calendar management mode</title>
</perspective>
</extension>

"/user_calendar.xhtml" only containing a String for test ...

Problem is i can see this test String everywhere , when i expected to see only when i i call "view_calendar.xhtml".
However i see my two default widget (tree and clipboard) dissapear when i call "view_calendar.xhtml".