How to create a drop down list in metro style apps using c#?

<ComboBox x:Name="comboBox1" SelectionChanged="ComboBox_SelectionChanged" Width="100">     <x:String>Item 1x:String>     <x:String>Item 2x:String>     <x:String>Item 3x:String> ComboBox>

You may refer this link for more details:
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/windows.ui.xaml.controls.combobox.aspx