System Tray

Question

Hi,
I used the code in this http://www.developer.com/net/csharp/article.php/3336751 link. It works but when I open abother form on my main form the number of icons appearing increase. In the program the user needs to open those forms and that becomes messy since the user sees more than 10 icons. How can I prevent those extra icons from appearing when another form is opened on the main form.