[Lazarus] Making a auto-complete dropdown list

[闫程远]

I'm using lazarus 0.9.26.the "bug" occurs only when my project is compiled
with GTK2.it's much better (though not perfect) with GTK1.

>
> Untested: Try to make the old *form* Active, because only the active
> form (or a component on it) can receive the focus. If this helps, it's
> worth further investigations WRT platform compatibility.
>
i've tried this ,but it didn't work.maybe i used it wrongly?

-- 
I'm sure that I will win.
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