Make it easier when mono 3.0 (mcs) compiler is used
Fix moon 3.0 (mcs) compiler breakage with Insert too. Fixes #11592.
Make the searchBar protected
* DialogViewController.cs: Make PerformFilter virtual so it can be overridden;

* Elements.cs: Make IndexOf public; fix the doc for Insert
Fix naming issue;
Simplify the removal of an element
Remove a single element with animation
Follow the public naming rules
Create an interface for elements with a tappable accessory. Change DVC to check for that interface instead of StyledStringElement
Fix for headers not showing when searching
Make SetupSearch protected virtual so it can be overridden
Make the IsPassword field protected so EntryElement can be more fully overridden
Make Placeholder protected as well so it can be overridden.
Make entry protected so it can be used by subclasses
Make group public with an internal setter so custom RadioElements can be created. Allow RadioElement to be overridden.
Inherit from NSObject so elements can be the target of observations. Need this so I can hide a popover when the app is put into the background.
Merge branch 'master' of https://github.com/akcoder/MonoTouch.Dialog