We are currently returing the text for the title and subtitle, the size of the popup is automatically calculated. Which text do you want to display, could you send us a sample so we can investigate this here?
If there was a word wrap feature for the "description" property, that would expand the annotation caption taller. Basically, I need two lines in the description.
Maybe if there was a #10 or #13, it would create a new line and expand the caption taller?
By default, the popup with a title and description size cannot be changed, it requires displaying a custom popup and that is not implemented. You can try to specifiy a label for the RightCalloutAccessoryView property of an annotation to provide more information.
lbl := TTMSFMXNativeUILabel.Create(Self);
lbl.Text := SubTitle;
RightCalloutAccessoryView := lbl;
A sample adding a button to a RightCalloutAccessoryView can be found in the Maps demo.