Marquee Style Progress Bar

Hi, I have read the MSDN Library for information on making a marquee style progress bar - one that keeps on repeating for when you're unsure of the current progress. The two methods I can see is to CreateWindowEx with the PBS_MARQUEE style, or to SendMessage with PBM_MARQUEE. How can I do it with the Windows Forms controls? It already creates the control with the default style; it's a sealed class I can't derive from (I was thinking of overriding the constructor). SendMessage doesn't seem to work; besides, the constant definition is inside commctrl.h which doesn't come with .NET. Also, is it possible to do a smooth progress bar? Thanks.