I cut that little hair in a "V" for the longest time, and started growing it out a few months ago, wish I had done so from the beginning. Someone recommended Pet Silk dog topknot gel, and I love it; it really keeps the short hairs in place. I found mine on E-bay
Pet Silk dog top knot gel for bow placement GREAT! - eBay (item 370018721746 end time May-21-08 09:08:41 PDT)