title: Webbrowser completed doesn't show all elements
body: <p>I have a webbrowser which is loading a website. If the website firing the "completed" event, my HTMLElementCollection shows me a count of "179". If I click on the button and call the same method to get all HTMLElements, it tells me a count of "194". The problem is: if the "completed"-Event is firing, some HTMLElements are not loaded, and needs a longer time, and my HTMLElement which I need to click on it, is missing too.</p>
  
  <p>To explain with code:</p>
  
  <pre><code>private void Webbrowser_DocumentComplete(object pDisp, ref object URL)
          {
                  if (URL.ToString() == "testsite")
                  {
                      HtmlElementCollection c1 = webBrowser1.Document.GetElementsByTagName("div");
                      foreach (HtmlElement e2 in c1)
                      {
                          if (e2.GetAttribute("classname") == "btn3")
                          {
                              if (e2.InnerText == "follow")
                              {
                                  e2.InvokeMember("click");
                              }
                          }
                      }
                  }
          }
  </code></pre>
  
  <p>The count of "c1" is 179.</p>
  
  <p>If I wait 1-2 seconds and click then on a button with the same code like:</p>
  
  <pre><code>private void Button1_Click(object sender, EventArgs e)
          {
  HtmlElementCollection c1 = webBrowser1.Document.GetElementsByTagName("div");
                      foreach (HtmlElement e2 in c1)
                      {
                          if (e2.GetAttribute("classname") == "btn3")
                          {
                              if (e2.InnerText == "follow")
                              {
                                  e2.InvokeMember("click");
                              }
                          }
                      }
          }
  </code></pre>
  
  <p>The count of "c1" is 194.</p>
  
  <p>The question is: how can I wait some seconds if the page is build completed?
  I need the count of 194 because there is ONE HTMLElement which I want to click on it!</p>