Couple of questions for Merb 0.4

[Fernand Galiana]

All,

    I have just updated to the latest release of merb 0.4 and I am  
wondering how I can get my controller changes
    to reload without bouncing the server ? I am running in dev mode  
but my changes to my merb controller don't
    seem to get picked up on new requests.

    Also say I have a controller that needs to render an alternate  
xml format ie something like:

    respond_to do |fmt|
      fmt.xml => { render :xml => true, :action => 'fred' }
   end

   where in fred.xerb I have

   xml.blee do
     xml.fred some_val
    ...
  end

When I tried to run the following code I am getting a merb error on  
engine.transform where engine is nil ?

undefined method `transform' for nil:NilClass - (NoMethodError)
/usr/local/lib/ruby/gems/1.8/gems/merb-0.4.0/lib/merb/mixins/ 
render.rb:155:in `render'

What am I missing ?

-Fernand