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I want window contains listbox :note: " this is a comment" The window title is Test. and window width is 390. and window height is 500. I want button and button left = 250. and button name = btn1. The button caption is test. procedure btn1 mouse click. [x]. = (1). dowhile [x] <= (10). listbox must add from [x]. doif [x] == (3). listbox must add item this is number three. endif [x]. = [x] + (1). endwhile endprocedure