How to Create an XML Editor application tool in C#.NET

Question

Hi,

I want to create an XML Editor Tool in C#.NET (similar to what we currently have in Visual Studio).
I want this editor tool to be integrated in my project.

The intention in creating the tool is that I want to view and edit the XML in this tool itself. I should
be able to directly modify the XML in this XML editor and thereby persist it back. And the changes should be
reflected accordingly.
It should have a collapse-Expand feature. And if possible it should also support Syntax based colours.

Hence, the tool should be able to open any XML in the proper format(proper parsing check should be there)
and edit them and save it back.

I currently work in VS 2008 in C#.

It will be really helpful if someone put the code in implementing the same and thanks in advance for any kind of suggestions.