request two layers in search action of one PanelForm Can not you clone the formPanel object replacing the protocol1 with protocol2 and launch a second request then delete cloned object? So you click once and trigger two events? I do not use this library but have done things like you wish using other libraries.
Blank MapServer WMS image at low zoom levels in OpenLayers Well, try replace the projection from epsg:3857 to epsg:900913. They look quite same but they are a little different. Copy the WMS request and paste into a new browser tab. With a little lucky, if problem on Mapserver, then he will report the error on output. This should be an problem with OpenLayers computed bounds.