Vcl.DBCtrls.TCustomDBLookupComboBox.OnDropDown
Delphi
property OnDropDown: TNotifyEvent read FOnDropDown write FOnDropDown;
C++
__property System::Classes::TNotifyEvent OnDropDown = {read=FOnDropDown, write=FOnDropDown};
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
event | public | Vcl.DBCtrls.pas Vcl.DBCtrls.hpp |
Vcl.DBCtrls | TCustomDBLookupComboBox |
Description
Occurs immediately before the lookup list is opened.
Write an OnDropDown event handler to take specific action before the lookup list is displayed to the user. The list can be opened by the user or by calling the DropDown method.
For a TDBLookupComboBox, the code should look like this:
procedure TForm1.DBLookupComboBox1DropDown(Sender: TObject);
begin
StatusBar1.SimpleText := '';
end;