c# Add HelpButton to a MDI child form at run time

i'd like the following code to work (where this. is a MDI child form)

this.HelpButton = tru开发者_StackOverflowe;
this.HelpButtonClicked += HandleHelpButtonClicked;
this.Refresh();       

this code is being called after the mdi child form is displayed.

I wonder if i need to find some way of redrawing the title bar?

David

From the MSDN docs:

The value of the HelpButton property is ignored if the Maximize or Minimize buttons are shown.