Hybridwebview is not navigating to new Uri when the uri property is changed

I have a button and a hybridweb view inside a detail page of a master detail page in a Xamarin form application.On page loading I am setting the hybridwebview.uri="first url"(e.g.. http://google.com) On the button click I am setting hybridwebview.uri="second url" (e.g. http://gmail.com) . But the hybrid web view is not getting updated. It is still showing the first one i.e. google.com page.Can anyone help?