Add Thickness for Padding
<UserControl x:Class='SilverlightApplication3.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <Canvas Name="canvas1"> </Canvas> </UserControl> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; namespace SilverlightApplication3 { public partial class MainPage : UserControl { Button button1 = null; Button button2 = null; Button button3 = null; public MainPage() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { button1 = new Button { Content = "Button", Width = 70, Height = 23 }; Canvas.SetLeft(button1, 119); Canvas.SetTop(button1, 24); canvas1.Children.Add(button1); button2 = new Button { Content = "Wider" }; Canvas.SetLeft(button2, 44); Canvas.SetTop(button2, 69); canvas1.Children.Add(button2); button3 = new Button { Content = "Button" }; Canvas.SetLeft(button3, 78); Canvas.SetTop(button3, 119); button3.Padding = new Thickness(10, 2, 10, 2); canvas1.Children.Add(button3); } } }