如何在c# 4.0 WPF web浏览器应用程序中点击按钮或提交表单或单击url或单击图像

I am using C# 4.0 WPF application webbrowser element. What i want is after page load completed i want to click a particular link or submit a particular form or click a particular image or click a particular button.I am using C# 4.0 WPF application webbrowser el