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TCheckBox inside a TRichEdit


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With my collegues, we tried to implement a checkbox object into Rich Edit.
Is that possible anyway?


This seems not possible from within the IDE/ Object Inspector. However, if you create the checkbox instance dynammically (at run-time), then it works as expected.
For the following example, create a new form, drop a TRichEdit on it and create the checkbox in the FormCreate() event.

The button event handler code moves the RichEdit control at run-time around to demonstrate that the checkbox really is its child.

unit fMain;


  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ComCtrls;

  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    { private declarations }
    { public declarations }

  Form1: TForm1;


{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
  RichEdit1.Left := 100-RichEdit1.Left;

procedure TForm1.FormCreate(Sender: TObject);
  cb: TCheckBox;
  RichEdit1.Left := 20;

  cb := TCheckBox.Create(RichEdit1);
  // do not forget to set the
  cb.Parent := RichEdit1;
  cb.Left := 30;
  cb.Top := 30;
  cb.Caption := 'my checkbox';

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