I actually have a mini window (dialog) that shows bandwidth (up/down and the total is in the title of it). I have it set to check the position of the main mIRC window and every second and to move it to match the main window and at the same time to activate the main window again after moving it. That may be what you're trying to do. It isn't docked exactly, but it's enough for me and I don't really need to have a DLL to just handle that for me. DCX does have docking,though (I think).
If you want to see how I did that, let me know and I'll paste it when I get home... I forget how I have it set up right now.
