refrencing a new instance of a webbrowser

[ethicalhacker]

hey all
ive created a form with a tabcontrol and im also successfully able to create new tabs with new webbrowser instances on them during runtime but even when the new tab is open still the new url that i type in the textbox it gets navigated on the old tab only.
How do i make the new url typed open in the new tab
since i wont know the new tabpage name?