Adding Controls in Windows Phone - Add Button, TextView ..etc

Go to View --> ToolBox --> And you can add any controls.Or else you can add a bit of code as below.

 
 <Button 
   Content="Click Me" 
   HorizontalAlignment="Left"
   Margin="138,161,0,0" 
   VerticalAlignment="Top" 
   RenderTransformOrigin="0.617,1.507" 
   Height="117" Width="190" 
   Click="Button_Click_1"/>

Then to add click action for controls you can just double click the controls and you may navigate to xaml.cs page where you can add your code.

 
namespace AddControls
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();

            // Sample code to localize the ApplicationBar
            //BuildLocalizedApplicationBar();
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            Console.WriteLine("Iam being Clicked......");
        }