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Creating a toolbar programmatically in WPF

I'm trying to create a simple toolbar in WPF, but the toolbar is showing with no corresponding buttons on it, just a very thin blank white bar. Any idea what I am doing wrong, or what is the recommended procedure? Relevant code snippets:

        var tb = new ToolBar();

        var b = new Button();
        b.Command = comback;
        Image myImage = new Image();
        myImage.Source = new BitmapImage(new Uri("back.png", UriKind.Relative));
        b.Content = myImage;
        tb.Items.Add(b);

        var p = new DockPanel();
        //DockPanel.SetDock(mainmenu, Dock.Top);
        DockPanel.SetDock(tb, Dock.Top);
        DockPanel.SetDock(sb, Dock.Bottom);
        //p.Children.Add(mainmenu);
        p.Children.Add(tb);
        p.Children.Add(sb);
        Content = p;
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Without a third child for the Dockpanel p, the 'sb' element will fill everything except the tb area. The dashboard will automatically adjust (its height) according to its contents.

I suggest adding a simple text button first to test the overall layout:



var b2 = new Button();   
b2.Content = "B2";
tb.Items.Add(b2);

And then investigate what's wrong with the "back.png" image.

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