calendar not correct rendering
i got a modal panel with an rich:calendar and an iframe on my page which renders a pdf.
if i click on the calendar, the calendar is only visible until the border of the modal panel. so it's not completely visible.
my modal panel
<?xml version="1.0" encoding="ISO-8859-1"?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:rich="http://richfaces.org/rich"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:s="http://jboss.com/products/seam/taglib">
<rich:modalPanel id="upload" autosized="true" height="150" overlapEmbedObjects="true" zindex="333" rendered="true" >
<f:facet name="header">
<h:panelGroup>
<h:outputText value="Datei hinzufügen"></h:outputText>
</h:panelGroup>
</f:facet>
<a4j:form style="z-index:433" >
<rich:fileUpload immediateUpload="true" addControlLabel="Hinzufügen" maxFilesQuantity="1" progressLabel="Datei wird übertragen" doneLabel="Datei übertragen" clearAllControlLabel="Löschen" uploadControlLabel="Übertragen" fileUploadListener="#{WorkflowPage.listener}" style="z-index:433" cancelEntryControlLabel="Abbrechen" listWidth="600px" listHeight="100px" >
<a4j:support event="onuploadcomplete" reRender="uploadform" ></a4j:support>
</rich:fileUpload>
</a4j:form>
<h:form id="uploadform" style="z-index:433">
<h:outputLabel value="Datum" for="" />
<rich:calendar value="#{Page.datum}" datePattern="dd.MM.yyyy" style="z-index:433" />
<a4j:commandButton id="btnokupload" value="Ok"
oncomplete="if ( document.getElementById('uploadform:uploaderror') ==null ) Richfaces.hideModalPanel('upload');"
styleClass="rich-button" action="#{Page.savedok}" reRender="tabcurrentworkflow"
style="width:90px;float:left" >
</a4j:commandButton>
<a4j:commandButton id="btncancelupload" value="Abrechen" immediate="true"
onclick="Richfaces.hideModalPanel('upload')" styleClass="rich-button" reRender="upload"
style="width:90px;float:right;">
</a4j:commandButton>
</h:form>
</rich:modalPanel>
</ui:composition>
any solutions for this?