advice on creation of a control - or a window?

I've created a multimedia app that uses DirectShow to display multiple media streams simultaneously.

The app is a WTL MDI application.  For video windows, I use a CWindowImpl derived class - one per CChildFrame.

I'd like to add controls to the video windows (volume ctrls etc).

I'd initially thought about adding a slider (volume) control and a couple of buttons to a context menu - but later thought that this might not be the best approach.

I was looking at MS Word 2007 - which has a floating toolbar that allows you to change options on highlighted text.

I'd like to implement a similar floating toolbar for the video controls.    

I googled around a bit and found an old post about floating toolbars in WTL.  The response was - for a floating toolbar, create a popup window and make it's parent the main window.

I think that this sounds like a reasonable approach.

my questions:

 - Is this a good approach, or is there a more standard approach for a floating toolbar now in WTL?

 - Should I make the toolbar a child of the video window or the CChildFrame that contains the video window, in order to ensure that it always remains on top of the video? 

 - How can I implement transparency in the floating toolbar, as in the floating toolbar in MS word?



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