When linked items option is enabled, if the geo-located item is a polygon, polyline, or rectangle, it doesn't show all the linked items in the popup. The popup in this case can first show the list of linked items. When click an item, it then shows the popup content of that item. Maybe add a "back" button allowing to go back to the list in the popup. This doesn't need the expanding behavior like the markers.
When linked items option is enabled, if the geo-located item is a polygon, polyline, or rectangle, it doesn't show all the linked items in the popup. The popup in this case can first show the list of linked items. When click an item, it then shows the popup content of that item. Maybe add a "back" button allowing to go back to the list in the popup. This doesn't need the expanding behavior like the markers.