How to embed Gecko into other app.? (Use other toolkit)

[ASKA S.H. Zhong]

I wanna write a customizzed browser using gecko as  the core browsering window.
But the examples I found are gtk or gnome ones. 
Are any guild about embed gecko into applications developed by other X toolkits?

Or using gtk or gnome is my only two choices? :(s

Cheers,
ASKA