C# 如何在Aero/.NET4中获取块样式进度条

我有三种风格的进度条。“块”和“连续”现在渲染相同，而我记得用于渲染为块的块

这是.NET4、Aero Glass或Windows7独有的吗？如何告诉我的应用程序使用经典块？

使用此选项

public class ContinuousProgressBar : ProgressBar 
{ 
    public ContinuousProgressBar() 
    { 
        this.Style = ProgressBarStyle.Continuous; 
    }
    protected override void CreateHandle()
    {
        base.CreateHandle();
        try
        {
            SetWindowTheme(this.Handle, "", "");
        }
        catch 
        { 
        }
    }

    [System.Runtime.InteropServices.DllImport("uxtheme.dll")]  
    private static extern int SetWindowTheme(IntPtr hwnd, string appname, string idlist);
}