Can you provide us with a sample project or full code that clearing FlyGrid?
Probably you've used FlyGrid.BeginInit but not finalize this code with FlyGrid.EndInit method, use following code construction when use BeginInit:
[c#]
flyGrid.BeginInit();
try
{
//here is your code....
}
finally
{
flyGrid.EndInit();
}
[VB.Net]
flyGrid.BeginInit()
Try
' here is your code....
Finally
flyGrid.EndInit()
End Try