I'm using IdentifyGraphicsOverlayAsync to get my results from an GraphicsOverlay when I "Tap".
The Graphic i get has Geometry and Attributes with three Keys and Values and I then use "CalloutDefinition" to display the values in map and the Popup gets visible in the right location but its empty.
MyMapView.ShowCalloutAt( e.Location, myGraphic);
Well since that is a image I posted, yes it is possible. But there is a lot behind how it is implemented. It uses a custom view that has an items control bound to a collection built out from the PopupDefinition, There is a ShowCalloutAt method that takes a UIElement as a parameter and what you see in the above image uses that method. This was actually designed at 100.0 before the Callout feature was added to the API
Ok, thank you now. I know a little bit more. I'm right know trying to make some changes to the ControlTemplate of the Callout-Class to achieve something like this but not entirely happy with the result so far.
You will want to create a custom UserControl that can present the attributes of a graphic. Then create the user control and pass it into this overload, instead of using the Callout Definition: