TDateTimePicker zur Laufzeit verschieben

[DeddyH]

Delphi-Quellcode:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls;

type
  TDateTimePicker = class(ComCtrls.TDateTimePicker)
  public
    property OnMouseDown;
  end;

  TForm1 = class(TForm)
    DateTimePicker1: TDateTimePicker;
    procedure FormCreate(Sender: TObject);
  private
    { Private-Deklarationen }
    procedure DoOnMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TForm1 }

procedure TForm1.DoOnMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if (Button = mbLeft) and (Sender is TWinControl) then
    begin
      ReleaseCapture;
      TWinControl(Sender).Perform(WM_SYSCOMMAND, $F012, 0);
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  DateTimePicker1.OnMouseDown := DoOnMouseDown;
end;

end.

Hat bei mir funktioniert (Delphi 7, neuere Version habe ich grad nicht zur Verfügung).