Show help document in .chm file

Question

  private void btnhelp_Click(object sender, EventArgs e)
        {

            Help.ShowHelp(this, "file://e:\\Testchm\\test1.chm");
        }

I have created a test1.chm file.I can show this help file using above code.
But you can see there is topics as a tree view.
I need,When I click my button i need to focus one of topic in my help file.
as example button1 click then i need to show Getting Started -> Getting help.
How I set this path to my button
   Help.ShowHelp(this, "file://e:\\Testchm\\test1.chm");



Please help.This is very useful for finish my system.