Change flowScope value with commandButton - jsf

Question

I've a boolean variable in my view-state:
<set name="flowScope.render" value="false" type="java.lang.Boolean" />
Now i render a commandButton with this variable
<p:commandButton value="Show Dates"
rendered="#{!render}"
update="table1,buttons" />
Now i want to change the value of the variable with a click on this commandButton. I tried the setPropertyActionListener, but it doesn't work:
<p:commandButton value="Show Dates" rendered="#{!render}" update="table1,buttons">
<f:setPropertyActionListener value="true" target="#{render}" />
</p:commandButton>
I don't find much about how to change the value. So how is this possible?

Answer 1

Now i figured it out.
I must work with transitions. In the same view-state where the variable is set, there i define two transitions:
<transition on="rendertrue">
<set name="flowScope.render" value="true" type="java.lang.Boolean" />
</transition>
<transition on="renderfalse">
<set name="flowScope.render" value="false" type="java.lang.Boolean" />
</transition>
I don't change the value of the exist variable, i just overwrite it. If this is the best or cleanes solution, i don't know, but it works.
Now i call the specific transition with the action statement in the commandButton:
<p:commandButton value="Show Date"
rendered="#{!render}" update="table1,buttons"
action="rendertrue" />
<p:commandButton value="Hide Date"
rendered="#{render}" update="table1,buttons"
action="renderfalse" />