title: How to control number of items appearing in GridView rows and columns in a Metro Style GridView App?
body: <p>I create GridView app and in the itemspage after binding items with the grid, it appears with 4 rows and 5 columns, when I rotate ScrollViewer to Vertical.</p>
  
  <p>It appears with only one column. How can I control the number of rows and columns?</p>