I also know about following ways to show/hide raster images:
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Raster images are one way of handling images in NX. Depending on your intent and process you might want to have a look to the Decal Sticker function.
If I understand it correctly you want to be able to navigate and manipulate the instances of raster images from the Part Navigator. This is possible if you expand the Dependency Tab in the Part Navigator. Here you will be presented with all the instances of your Raster Images and you will be able to use the red tick to turn them on and off as you like. The Raster Image function is limited to Planes or to be based of planar faces. In other words you can associate the Raster Images with planar entities. Please watch the attached movie file for clarity.