Back and Next functionality using web viewer component

I know it is going to be a very basic question,but i need to know it anyway.I have given the link of an fb page in my app,for example, when i am taken to the fb page,i check my fb message inbox.Now i want to go back to my fb page but when i click my device back button,the app takes me to the button which i am using to launch the web viewer component.In short,i want to add the functionality of back and next in my web viewer component which can take me to the previously and next visited page.I am new to this component.I wish to be guided.



put the WebViewer.GoBack method into the Screen.BackPressed event