Find element feature

I want to write ie based web developer tool with find element feature. i am usi开发者_运维技巧ng c# and wpf and my application should looks like ie developer tool:

or firebug:

Any suggestion?

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To consolidate a bunch of answers:

You can either:

• Host IE in your app
• Make an IE plugin

To highlight an area, you should look at http://www.codeproject.com/KB/dotnet/NetHtmlEventHandler.aspx