>Why does the valid event always fire even if it's not in edit mode, or even if the user doesn't change value? Why can't the valid event fire only when the value changes?

Dodi,

The valid event (which originated in 2.x) has the purpose of validating input prior to the control losing focus (LostFocus). I suppose you could add a flag that could be set in InteractiveChange the interactive change event for whether or not the valid event code needs to be executed, but you'd still have to check for it in Valid.