Changing the Tool with Speed Buttons

Each drawing tool needs an associated OnClick event handler. Suppose your application had a toolbar button for each of four drawing tools: line, rectangle, ellipse, and rounded rectangle. You would attach the following event handlers to the OnClick events of the four drawing-tool buttons, setting DrawingTool to the appropriate value for each:

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procedure TForm1.LineButtonClick(Sender: TObject);{ LineButton }
begin
DrawingTool := dtLine;
end;
procedure TForm1.RectangleButtonClick(Sender: TObject);{ RectangleButton }
begin
DrawingTool := dtRectangle;
end;
procedure TForm1.EllipseButtonClick(Sender: TObject);{ EllipseButton }
begin
DrawingTool := dtEllipse;
end;
procedure TForm1.RoundedRectButtonClick(Sender: TObject);{ RoundRectButton }
begin
DrawingTool := dtRoundRect;
end;

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void __fastcall TForm1::LineButtonClick(TObject *Sender)  // LineButton
{
  DrawingTool = dtLine;
}
void __fastcall TForm1::RectangleButtonClick(TObject *Sender) // RectangleButton
{
  DrawingTool = dtRectangle;
}
void __fastcall TForm1::EllipseButtonClick(TObject *Sender)  // EllipseButton
{
  DrawingTool = dtEllipse;
}
void __fastcall TForm1::RoundedRectButtonClick(TObject *Sender) // RoundRectBtn
{
  DrawingTool = dtRoundRect;
}