Unfortunately this is one of those multi-part questions which mean an 'Answer' has to answer all parts of it to be a true answer. I don't have time to deal with the 'Next' and 'Prev' buttons so here is a comment of the radio buttons:
Radio buttons generally work best when contained within a uibuttongroup. This controls the mutual exclusivity that is a key part of radio buttons (and seems to be important for yours too - i.e. you don't want two selected at the same time). If you don't use a uibuttongroup you have to program callbacks for all your buttons (although the same callback for all should work), but within that you have to program the mutual exclusivity yourself which is tedious.
If you do use a uibuttongroup then you set the
'SelectionChangedFcn'
property of the uibuttongroup, query the
'SelectedObject'
of the buttongroup in this and then select your image based on that (which will be the handle of whichever of your radiobuttons is selected). If you have your radiobuttons all collected in an array and images also in a same-sized array you can find the index of your selected radio button within that array and use the same index into your image array to retrieve the correct image.
