>Where is the best place to validate user input ? I used (FPW 2.6) to make validations in the "When" event of the "Ok"/"Save" button, but I can't set the focus back to the right control.
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>What is your opinion about this ?

I run a CheckValid method when Save is clicked to check for everything. I create a global array to hold error messages (validation failure, not system errors) and matching controls. If there are any validation failures I set a form ValidErrors property to TRUE. I then show a modal form listing all validation failures with an OK button. When they hit OK and focus returns to the calling form, if the ValidErrors property is TRUE, I use form.control.SetFocus() to the first control in the array.

I just don't like using LostFocus or Valid for anything but very rudimentary checking, such as blanks and such.

Just my thoughts.