To be more clear/specific:
I have a layer in my map service and in the map and want to create map tips for it.
I create a feature layer in xaml pointing to the same layer and render it with a transparent symbol, so it appears that when the user hovers over the feature from the map service they get the map tip.
I want a way to connect the visibility of the layer in the map service and the visibility of the feature layer that controls the map tips. So they work in concert with each other.
Or is there a way to connect map tips with a dynamic layer instead of a feature layer.