Advanced Web Browser control

Question

Hey all, I was just wondering if either: A.) Is it possible to modify the current WebBrowser control to allow me to determine which element the mouse is hovering over and maybe even allow me to click it? or B.) Is there an open source or free control out there that would allow me to do the above? I kinda think of the firebug addon for firefox where you can click on an element in the browser and it takes you to the code where that element is. Another example of what i would like to do would be similar to the design view of visual studio. To be able to click an element and move it around. It doesnt have to be as advanced as that but I have always wanted to know how it is done. Thanks for any help!