Custom Input Panel - duplicate key tap question

Using VS2008, .NETCF 3.5, C#, I created a custom SIP based on Alex
Yakhnin's sample posted here:
http://blog.opennetcf.com/ayakhnin/C...egory,SIP.aspx

The SIP works great (Thanks Alex!), except for one small issue which I
hope to resolve: When the same key is hit twice in row quickly, the
second hit does not register. If I hit a key, wait a second and tap it
again, the second hit registers like it should. If I quickly hit
several different keys, they will all register.

Does anyone have any ideas?

Thanks!