# 4579 TListBox Control KeyPressInterval Property Not Exhibiting Consistent Delay

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Create a simple form, buttoncombo, label. Set keypress time to 2000 to ensure test is good. Add OnChange event as below. Add list items:

one
two
three
four
threesome
five
1234567890
six
threemore

Now watch as you type "four". Or threemore (or threesome). What happens is that the OnChange is triggered whenever the selection "jumps" to a new match. Which means that it is pretty much guaranteed to jump the first time, and then again for each change.