Question: There's this website I've been working on for a client of mine and I've been working on the mobile layout. I decided to use a flexbox layout for the overall website, but for some odd reason, the stock android web browser for 4.4.2 isn't loading any of my elements that are using flexbox. Chrome for Android loads all my elements using flexbox just fine. I can't be too sure of what's happening, but any help that can be given would be great. All my code is on "hoopactivation.x10.mx" if you use the developer tools. If need be, I can also post my code on here if neccesarry (Which will probably happen anyhow. I'm just not near my laptop right now).

Answer: 
If you want to set `ddlBookCategory.AutoPostBack = true;` dynamically then set that in pageload event.
You need to add AutoPostBack =true to the control in order for the control to signal back to the server that an event has occurred. Once you do that you can set an event handler to a method in your code behind for the selected index changed event on that control.