Aware IM automatically refreshes the screen when a choice is made in a dropdown under the following conditions:
1) The drop down represents a reference attribute, not just a text attribute with a list of choices
2) In presentation options of some other reference attribute of this object there is a filter query defined that depends on the value of the reference attribute in 1).
For example, if I select a particular car model the list of accessories should automatically change to reflect the choices applicable to this model. In this case I would have two reference attributes defined - the list of car models and the list of accessories. For the list of accessories I would define a filter query that would find choices based on the current value of a car model: FIND Accessory WHERE Accessory.Model = Car.Model
Having said that, there was a bug in the earlier versions that caused unneccesary refresh. So if you do not have filter queries defined as per above and the screen still refreshes, you are likely to use the older build. Please download the latest version.