C#

// Define an alias for easy use since the class and property name cause problems
using CP = System.Windows.Forms.CreateParams;
// ...
const int BS_DEFPUSHBUTTON = 0x01;
protected override CP CreateParams
{
  get
  {
    CP cp = base.CreateParams;
    cp.Style |= BS_DEFPUSHBUTTON;
    return cp;
  }
}

//create brush for text
Brush blackBrush = Brushes.Black;

//draw little rectangles with the appropriate color and write the legend text
for(int i = 0; i < m_DataSource.Count; i++)
{
    SolidBrush sliceBrush = new SolidBrush(m_DataSource[i].SliceColor);

    graphics.FillRectangle(sliceBrush, origin.X + 5, origin.Y + 5 + (m_FontLegend.Height * i), 10, 10);

    string strText = m_DataSource[i].Name +": "+ m_DataSource[i].Value.ToString();
    int iStartX = origin.X + 20;
    int iStartY = origin.Y + 1 + (m_FontLegend.Height * i);
    graphics.DrawString(strText, m_FontLegend, blackBrush, iStartX, iStartY);

    sliceBrush.Dispose();
}

//don't forget to dispose the text brush
blackBrush.Dispose();