simple primefaces dialog does not affect value to property - jsf

Question

I have a simple input text inside a primefaces dialog with a command button to test if the variable gets his value but when i click the command button with(process="#this" when i delete it the button dont work any more)to print the value of the property it shows always null ... the dialog is rented by a command link from a data grid and when i delete the dialog every thing works fine and the property get th value this is the jsf page :
<p:layoutUnit id="center" position="center"
style="min-height:400px;min-width:300px;overflow-y:hidden !important"
header="#{messages['layout.center.header']}">
<f:view>
<h:form >
<p:dataGrid var="c" value="#{rentMB.carsList}" columns="3"
layout="grid" rows="12" paginator="true" id="cars"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
rowsPerPageTemplate="6,12,16">
<f:facet name="header">
Available Cars
</f:facet>
<p:panel header="#{c.car_brand.brand_name}"
style="text-align:center">
<h:panelGrid columns="1" style="width:100%">
<p:graphicImage url="/images/#{c.image}.jpg" />
<p:commandLink
oncomplete="PF('carDialog').show()" title="View Detail">
<h:outputText styleClass="ui-icon ui-icon-key"
style="margin:0 auto;" />
<f:setPropertyActionListener value="#{c}"
target="#{rentMB.selectedCar}" />
</p:commandLink>
</h:panelGrid>
</p:panel>
</p:dataGrid>
</h:form>
<h:form>
<p:dialog header="Car Info" id="carInfo" widgetVar="carDialog" width="900px"
height="400px" showEffect="fade" hideEffect="fade"
resizable="false" appendToBody="true">
<p:outputPanel>
<h:panelGrid columns="3" >
<f:facet name="header">
Client informations
</f:facet>
<h:outputLabel for="adress" value="Adress : *" />
<p:inputText id="adress" value="#{rentMB.adress}"
/>
<p:watermark for="adress" value="Adress" />
<p:commandButton action="#{rentMB.affiche}" process="#this" value="Rent" oncomplete="carInfo.hide();" > </p:commandButton>
<p:commandButton type="reset" value="Reset"> </p:commandButton>
</h:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>
</f:view>
</p:layoutUnit>
</p:layout>
</h:body>
</f:view>
</html>
the code of rentMB.affiche() :
public void affiche()
{
System.out.println(this.getAdress());
}

Answer 1

the solution is to put the content of the p:dialog between <h:form></h:form> and add to dialog appendToBody="false"