Datagrid Help Needed

I have reported a number of problems with the datagrid. Now I am getting close to releasing to a client and I need to do something.

Since the up and down arrows of the datagrid scrollbar does not work after adding rows in code, I need to block or cover up the up and down arrows of the datagrid scroll bar to prevent the users from clicking on them and messing up the datagrid display. I want them to "only" be able to use the drag bar of the scroll bars since it works fine. It's when the user clicks on the up or down arrows the problems begin. I have tried several ways to correct this problem with no results.

I have create a new datagrid and transferred the code and get the same problems. I have tried cloning and get the same problem. There is something damaged with the control or code but I don't see anyway to correct it.

I could release the programs with the problems but it makes the program look buggy.

Anyway, what can be placed above the datagrid to cover small areas. Is this possible? Can multiple layers handle this?