The case: A lot of features need to be rendered on an openlayers map. Drawing all features on the map (WFS) causes performance issues (especially in IE). Therefore I have chosen to use WMS so that the client is spared the heavy rendering load.
The problem: To get information about certain features I use "Openlayers.Control.GetFeature". This works, but only when you use one layer.
I have multiple layers with different feature types. I still need to be able to use the box selection method. It may be that this exceeds the openlayers limits.
Adding multiple select controls did not seem to have any effect.