C#: How to link help file to mdi application

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C#

hello everybody

I am developing a c# application. In my application I want to show help file in menu item. Thats why iam using this code

private void helpfileToolStripMenuItem_Click(object sender, EventArgs e)
{
    Help.ShowHelp(this.menuStrip1,chmpath);
}

it is working well but the problem is if i goto another child form in my mdi form the help file not minimized.

How do I minimize and maximize the help file in a MDI form by default and wich properties are set in my mdi form?

Thanks for the help.