I have a visualforce page that needs to be able to set the owner of a custom object to either a queue OR a user. The standard apex:inputField tag will only pull up users as it's a custom object and not a true case object.

I have the controller side fully working, when I pass in ownerType via a GET property in the URL everything works as I'd like it to, but I can't quite get it working without having to refresh the page.

Fundamentally, my issue is that I can't figure out how to reference the value of the Owner Type selectList.

Here's the relevant snippet of visualforce: 

              <apex:pageblockSection id="ownerList">

              <apex:pageblockSectionItem >

              <apex:outputText value="{!ownerType}" />

              <apex:selectList value="{!problem.ownerId}"  size="1">

              <apex:selectOptions value="{!owners}" />

              </apex:selectList>

              </apex:pageblockSectionItem>

              <apex:pageblockSectionItem >

              <apex:outputText value="Owner Type"/>

              <apex:selectList id="ownerType" value="{!ownerType}" size="1">

              <apex:actionSupport event="onchange" rerender="ownerList" immediate="true" status="status">

              <apex:param name="ownerType" value="{!$CurrentPage.parameters.ownerType}" assignTo="{!ownerType}" />

              </apex:actionSupport>

              <apex:selectOption itemValue="user" itemLabel="User"/>

              <apex:selectOption itemValue="group" itemLabel="Group"/>

              </apex:selectList>

              </apex:pageblockSectionItem>

              </apex:pageBlockSection>

I'm rather sure that the problem is in the apex:param tag, but I can't figure out what to set the value of the param tag to. I tried $CurrentPage.parameters.ownerType but it came back null when the ownerList pageblock was rerendered.

Thanks for the wonderful support community!