Borland StringGrid

I'm using Borland C++ Builder 5.

Here's what I'm trying to achieve:

Limit the number of characters input to the cell to two(2).

I have 2 columns, cell[0][1]...cell[0][n] is sequencially written with an int commencing at 1 through to n, each time a cell[1][n] input a number, and the 'Enter' key is pressed or the focus is set to another cell or component.

Don't know how to do this. Perhaps, someone here could help me.