Delphi help

I decided to test my Delphi knowlege today by making myself a calculator. Took me a while, bu I figured most of it out. It all works well, except for one problem.
If, for example, you press 9 + 2 + 5, what I'd love it to do is to clear the screen when the next button after the plus sign is pressed, entering only the value of that button, clearing the values that were there before it. Can anyone help? I know that it's probably some sort of On..... thing.
Anyone here insane enough to know any Delphi anyway?:new::nocomment

Delphi was revered throughout the Greek world as the site of the omphalos stone, the centre of the earth and the universe.
jack
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