in our program, we use UltraWebGrid to fetching data.

some data in our db is number type, and it can be editable in the UI,  we use the asp:RangeValidator(we do need) validator to control the column data input.

there is a strang scenario happens like this,
if we input the none-number content to cell and the validator will throw error message to user, and the grid will forbid user operate other cells in the grid unless user change the non-number content.
but user can click other controls out of the grid(in our program is Submit or other dropdowlist or else). We once want get the none-number content for further verify(stop user to click other controls out of grid), but it will get null value(the asp:RangeValidator will auto change it).

somebody will say, you can verify the value if it is null, but in our program null is acceptable.

our question is, is there a way to forbid user operate other controls when there has some errors in the grid?

thanks in advance and i will be waiting on-line.