How to create a simple addin for VS2003 in c#

Question

Hi All,
Please tell me how to create an addin for Visualstudio 2003....
The addin should with a Window and It shold look like a any other tool window like Controls||solution explorer||Server explorer etc...
and It should display the whole file in solution in a list box.....
Plzzzzz any owne help me... or atleast tell me how to create an IDE for my addin... Already I created one addin but the problem is that the the form I added to the addin will appeare as a seperate window... I cant Integrate that into the VS2003 IDE like other addins :((