Because the code is generated in the code behind it will not be persisted between postbacks, except you explicitly recreate it each time (probably in Page_Load). But then you might have to track the item you selected and set that as selected after each regeneration on postback.
You need to create the drop-down list & bind the event early, in pageInit. It will be then be aware that be able to participate in the postback process & raise events for selectedindexchange.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.