I have one idea. In order to see how all works you can demux this BD3D and import demuxed IES file into IG Editor. IG Editor will show you all structure and navigation commands.
"Hi! Yes, you can simple change image or add any new button on any menu Page in IG Editor. How to do it step by step is described in Help file. Palettes will re-calculated automatically by pushing on one button in Toolbar.