Samantha,
OK I have figured this out but will need more info from you to provide code and where you should put the code.
It is actually quite simple you just need to obtain an instance of the layer that you want to hide from the Legend and the Layer List widget and assign this:
layer._basemapGalleryLayerType = 'reference';
but what I need to know is:
- will the layer be coming from a webmap or a widget like the Local Layr widget?
- Do you want it hidden at startup or when a widget is launch, button clicked, etc?
