Syn and unsyn contents in 2 Webbrowser controls

Question

I want to have 2 webbrowser controls and 1 button. With the 2nd webbrowser control always showing whatever is being displayed in the 1st webbrowser control. For example, if I click a link in the 1st webbrowser, the new content showing in this control should also refreshed on the 2nd webbrowser control. However, when I click the button, whatever being changed in the 1st webbrowser control WILL NOT be reflected in the 2nd webbrowser control ie they become independent.  Any idea of doing this?

Thanks
Gamer12