Puppet users - Aug 2014 - How to parameterize ntp service_ensure on puppet dashboard

Hi, I am trying to pass parameter from Dashboard to modules. For my own 
testing modules "createfile", it works fine: I can pass file_name
variable
value from Dashboard to it.

class createfile ($file_name=$::file_name) {

    file {"/tmp/${file_name}":
       ensure => present,
       mode   => 644,
       owner  => root,
       group  => root,
       content => "Hello, world2\n",
    }
}

However, now I am trying to do the same to NTP module and can't get it to 
work.
I downloaded the NTP module from Puppet Forge. I am trying to control the 
value of "service_ensure" from Dashboard, either "running"
or "stopped".

The original structure is like this:

In init.pp, $service_ensure is defined as a global variable with :: in 
front of it:
class ntp (
  $service_ensure   = $ntp::params::service_ensure,

In service.pp, it points to the service_ensure varible:
 service { 'ntp':
      ensure     => $service_ensure,

In params.pp, it hardcoded the service_ensure as 'running"
$service_ensure = 'running'

So I thought I can just remove "running" from the params.pp and it
should
then take the value I placed on Dashboard.
But it doesn't work.

I tried many combinations and still can't get it to work. 
Any clue? 
Many thanks!

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