Custom java Hyperic plugin development

Have a custom Collector which is setting values

setValue("ProcUptime", "12");

Using

<service name="CustomCollector">

     <plugin type="measurement"

             class="org.hyperic.hq.product.MeasurementPlugin"/>

     <plugin type="collector"

             class="com.ash.CustomCollector"/>

     <filter name="template"

         value="customPL"/> ...

Once I set the values into Collector will this MeasurementPlugin pick those attributes from <metrics> from plugin xml and pick values from Collector?

I am not able to pick those values in HQ UI.

Could you please let me know how these custom collectors are used and how to configure one?

Thanks in advance.

Ashok