Delphi Firemonkey XE8 TComboBox is unfolding and closing after a seconds


I build all TComboBox fields programmatically,

all is working fine, with one exception.

In one panel all TComboBox-fields are immediately closed after clicking on it.

They are only unfolded for seconds….

What could be a reason for that?
I can’t find any differences to the other panels.

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