/// <summary>
/// 绘制按钮
/// </summary>
/// <param name="g">The Graphics.</param>
/// User:Ryan CreateTime:2011-08-02 14:23.
private void DrawButton(Graphics g)
{
Rectangle btnRect;
EnumControlState btnState = this.GetComboBoxButtonPressed() ? EnumControlState.HeightLight : EnumControlState.Default;
btnRect = new Rectangle(this.ButtonRect.X, this.ButtonRect.Y - 1, this.ButtonRect.Width + 1 + this._Margin, this.ButtonRect.Height + 2);
RoundRectangle btnRoundRect = new RoundRectangle(btnRect, new CornerRadius(0));
//Blend blend = new Blend(3);
//blend.Positions = new float[] { 0f, 0.5f, 1f };
//blend.Factors = new float[] { 0f, 1f, 0f };
GDIHelper.FillRectangle(g, btnRoundRect, SkinManager.CurrentSkin.DefaultControlColor);
Size btnSize = new Size(12, 7);
GDIHelper.DrawArrow(g, ArrowDirection.Down, btnRect, btnSize, 0f, Color.FromArgb(30, 178, 239));
Color lineColor = SkinManager.CurrentSkin.BorderColor;
GDIHelper.DrawGradientLine(g, lineColor, 90, btnRect.X, btnRect.Y, btnRect.X, btnRect.Bottom - 1);
}