Command action in conditionally-rendered panelGroup doesn't

[alextemnokhod]

My last Seam-related problem: when condition changes in 'rendered' attribute and page redisplayed, a commandButton doesn't invoke action method:

 <h:panelGroup rendered="#{not empty category}">
 <h:commandButton value="Save" action="#{categoryConversation.save}"/>
 </h:panelGroup>

Why 'Save' button pressing doesn't invoke categoryConversation.save() method in this case (inside a conditionally-rendered panelGroup)? How to solve this problem?
Hope you can help.

[alextemnokhod]

I solved this problem. I had 'category' variable in UNSPECIFIED scope.

// problem here
 @Out(required=false)
 private Category category; // Category bean doesn't have @Scope annotation - to avoid BL & UI mixing

// now working
 @Out(required=false, scope=ScopeType.CONVERSATION)
 private Category category;