a way you can see to add a MaxGUI control to an otherwise wx driven application.
On Win32 it should be relatively easy.
On OS X, not likely, since wxMax on Mac is Carbon, and MaxGUI is Cocoa - which are not entirely interchangeable. So you can't, for example, add a Cocoa window to a Carbon app, but you can add a Carbon window to a Cocoa app.
However, I think I've seen somewhere, some work with regards implementing WebKit with wxWidgets (on all three platforms), and it apparently works. Although Webkit is like a 200meg download *just* for the source project, so I'm not planning on taking a look at that in a hurry :-p
From what I've read, the reason there isn't a native HTML widget API with wxWidgets is because each browser API is very incompatible with the other, and noone appears to want to write lots of wrapping code to have a single API for all. Which is fair enough.