Hi,

I had to tweak a little to get working.

i am using visual studio 2008.  not Vs2010 which i think your sample was built in?

Anyway, I added/changed the  property

and can regenerate the error.

I have also added some javascript to show page width.

the exact widths where this occurs may be different for you. 

For this example on my system there is a 4 pixel range where the grid vanishes.

if the size is changed between load and postback all is ok.

I had attached updated files and document with screenshots.

the exact width on your system may be different.

I believe i an using the latest files i have access to.

I do not have webUIFramework.

thanks