I need to show a warning on button press but only once for the first button press. This sounds really simple but yet I can't figure out how to do it in Zoho Creator as all variables seems to have local scope so I can't determine if the button was pressed before. I've been searching if there are global variables in Zoho but found only workarounds with creating another applications for that case. I've also tried creating a field on my form and hiding it to pass some value there if the button was pressed so next time I can check this field but is not working for some reason.

In validation part I'm assigning new value to a field

warning_shown=true;

But on a form this checkbox remains unchecked after the button press and next time I press the button warning_shown equals false.

Thanks!