Make Widget window.
Often you may wish to include the presentValue property, as shown here.

The screen captures shows binding to a BacnetVirtualProperty in a Px view.

The screen capture shows the default set action and resulting popup for write to a present_value property.
By default, in the case of a write to the presentValue property of a BACnet object with a priority_array (such as an Analog Output or Binary Output), the write action is issued at priority level 16. You can specify another priority level by editing the ord used in the Px binding (to the Bacnet virtual component).