title: Accessing main Page UI in user Control
body: <p>I have mainPage.xaml and userControl.xaml.I called userControl in mainPage. mainPage has a Grid named "grd" and userControl has a button named "btn". Now when I will click on button then click event of userControl will be raised. In this event, I want to hide the Grid(that in  mainPage.xaml). How can I access mainPage controls in userControls ?</p>