In order to refresh a data view, you'd need to refresh the data view's object. That can be done in a microflow using the change activity.
You can define a custom behavior of the "close", "cancel", or "x" buttons on a pop-up, and use a microflow to refresh the object. Here's how to set this up:
Finally, in order to set the pop-up's "x" button to run this microflow, you need to access the properties of the pop-up page, and look for the "close action" setting. In that dropdown, you'll be able to select the button you created above.
Hope that helps! If you have any follow-up questions feel free to comment or add edits to your question above.
Looking at this a little more, if I have a standard Data Grid on the home page, and update a popup item the grid refreshes.
I've been using the Bizzomate Google Timeline Chart widget from the App Store and this does not refresh.
@Bizzomate, do you know if possible to refresh this widget?