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Validating Values in fields

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Hey people.

I'm experiencing problems when validating values in fields
I currently validate whenever I loose focus on a field but the problem is that I display a message box each time the value is incorrect.
So when you go into a new field and the last field had an incorrect value it will loose focus from the new field when the message box pops up and so it validates that field as well.

I tried flagging it when focus is gained (and only then validating it), but it seems to gain focus on the next field before it displays the message box and so reseting the flag.

thanks Dylan.
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