Adding Button in StatusBar !

Even with System.Windows.Controls.Primitives.StatusBarI did

           this.statusBar = new System.Windows.Controls.Primitives.StatusBar();
           this.statusBar.VerticalAlignment = VerticalAlignment.Bottom;
           this.statusBar.Visibility = Visibility.Visible;

            this.buttonOK= new System.Windows.Controls.Button();
            this.buttonOK.Content = "Generate Output";
            this.buttonOK.Margin = new Thickness(0, 0, 0, 0);

            this.statusBar.Items.Add(this.buttonOK);
            this.canvas.Children.Add(this.statusBar);

Now it takes button (So first part is done) but this status bar appears on top left corner and not at the bottom...