That can be easily fixed. You just need to add a flag which changes when the form has been activated and the code is executed the first time and you must check this flag every time before executing the
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This Article will show you how to validate number with TEdit control,
What's the TEdit control?
TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text.
Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview. I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…