I would recommend checking out the Demo project that we have available for download on the Inductive Automation website. In the Ignition Demo project, the Windows.Realtime Status and Control.Pump Popup window is setup in the manner I believe you are looking to accomplish. This popup is called by clicking on the following component on the Windows.Realtime Status and Control.Example 1 Dairy Plant:
Hopefully this working example will help you get a better understanding how the template should be configured to achieve what you are looking for.
Garth