How to forcefully set IE’s Compatibility Mode off from the server-side?

In a domain-controlled environment I’m finding that the compatibility mode is triggered on certain clients (winXP/Win7, IE8/IE9) even when we are providing a X-UA tags, a !DOCTYPE definition and “IE=Edge” response headers. These clients have the “display intranet sites in compatibility view” checkbox ticked. Which is precisely what I’m trying to override.

Disabled button with a alert is clickable in IE8 (browser compatibility Issue in Asp.net website)

I have disabled a link button and image button(which is inside a link button so that I can show a Alert) and it works fine in Chrome, but when I open it in IE8 the image is disabled but when i click it it shows the popup(‘Are you sure you want to delete this User?’). Why am I getting this error in IE8 and IE7, how can I fix this.