How to hide custom toolbar in IE browser using C#

Question

We are building our own tool bar for IE.We have a requirement saying when user click one menu we need to hide this toolbar.I am doing it like this.

 foreach (InternetExplorer ie in new ShellWindowsClass())
 {
  string currenturl = ie.LocationURL;
  ie.ToolBar = 0;
  ie.AddressBar = true;
  ie.MenuBar = true;
  ie.StatusBar = true;
 }

with this code it is hiding menubar,address bar and statusbar of IE.but I want to hide only my toolbar.How can i do this?