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Validation of cells in a grid
I need to validate cells in a grid so for example, in the first column, the user must enter an 8 digit number. If the user enters something else (like 'abc' for example) I want to show an error message or if the user enters '123' - ie. only 3digits long an error message appears when the user tabs along to the next cell. Does that make sense? I can't really find anyway to do it! HELP!!