Get Bitmap from TCheckBox Component

{$IFDEF VER150}
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls,
  Themes;
{$ENDIF}

  
//

function GetCheckBoxBitmap(Checked, Hot : boolean; BgColor : TColor): TBitmap;
const
  CtrlState : array[boolean] of integer = (DFCS_BUTTONCHECK,
    DFCS_BUTTONCHECK or DFCS_CHECKED);
var
  CBRect : TRect;
  {$IFDEF VER150}
  Details : TThemedElementDetails;
  {$ENDIF}
  BgOld : TColor;
  ChkBmp : TBitmap;
  ThemeOK : boolean;
  x, x2, y : integer;
begin
  Result := nil;
  try
    Result := TBitmap.Create;
    ChkBmp := TBitmap.Create;
    ThemeOK := False;
    with Result do
    begin
      Width := 16;
      Height := 16;
      with Canvas do
      begin
        Brush.Color := BgColor;
        FillRect(ClipRect);
        ChkBmp.Assign(Result);
        CBRect := ClipRect;
        CBRect.Top := 1;
        CBRect.Left := 1;
        {$IFDEF VER150}
        if ThemeServices.ThemesAvailable then
        begin
          if Checked = True then
          begin
            if Hot = True then
              Details := ThemeServices.GetElementDetails(tbCheckBoxCheckedHot)
            else
              Details :=
                ThemeServices.GetElementDetails(tbCheckBoxCheckedNormal);
          end
          else
          begin
            if Hot = True then
              Details :=
                ThemeServices.GetElementDetails(tbCheckBoxUncheckedHot)
            else
              Details :=
                ThemeServices.GetElementDetails(tbCheckBoxUncheckedNormal);
          end;
          ThemeServices.DrawElement(Handle, Details, CBRect);
          for x := 15 downto 0 do
            for y := 15 downto 0 do
              if ChkBmp.Canvas.Pixels[x, y] <> Pixels[x, y] then
              begin
                ThemeOK := True;
                break;
              end;
        end;
        {$ENDIF}
        if ThemeOK = False then
        begin
          CBRect.Left := ClipRect.Left + 2;
          CBRect.Right := ClipRect.Right - 1;
          CBRect.Top := ClipRect.Top + 2;
          CBRect.Bottom := ClipRect.Bottom - 1;
          DrawFrameControl(Handle, CBRect, DFC_BUTTON, CtrlState[Checked]);
        end;
      end;
    end;
  finally
  end;
end;

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
   Image1.Picture.Bitmap.Assign(GetCheckBoxBitmap(true, true, clBtnFace));
end;