Erik,..

The idea of making one of button's Cancel property to true,... I've been thinking about it,
But I've made prediction that it would Release the form,... so I've been trying
the opposite way,..

I set the Stop Default button's property to .T. and now I can quit the loop but stil it doesn't react quickly (like the behavior of "Stop" button in Find File of Windows,...)

Maybe now I'll give it a try,... thanks, a lot for your solution,... it's help me much,...