customised right click menu on a browser window

is there any way to override the right click menu in an embedded web browser? I want to change the menu so that open in new window does something different

Public Sub BrowserWindow_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles BrowserWindow.MouseDown

gives an error at compile time

An unhandled exception of type 'System.NotSupportedException' occurred in system.windows.forms.dll

Additional information: The MouseDown event is not valid on this ActiveX control.

am i doing something wrong?

J