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Just a small issue I ran into while developing an application: A TComboBox that did not closeup properly.
In my particular case, the TComboBox was located on a TTabSheet (of a TPageControl). Based on the users selection another TTabSheet would be shown effectively hiding the one that was holding the TComboBox. This resulted in the combobox dropdown remaining visible, even though the combobox itself was no longer visible.
It took me a while to find a solution, which proved rather simple: Change the active focus to another component.
...
// handle reading the selected item and such here
...
AnotherComponent.SetFocus;
Application.ProcessMessages;
...
