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Change KeyValue in UniDBLookupComboBox


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How I can change KeyValue  UniDBLookupComboBox in code?

void __fastcall TMainForm::UniDBLookupComboBox1CloseUp(TObject *Sender)
 if(UniDBLookupComboBox2->Items->Count > 0)//I see Count = 2
	 UniDBLookupComboBox2->KeyValue = 0;

But I do not see the data in UniDBLookupComboBox2.I had to make an extra mouse click to see the data.





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