Add WPF control at runtime

I've written a WPF UserControl, and want to add one or more of it to my Window at runtime when I click a button. How can I do that?

Edit: Further specification I want to add the usercontrols to a Canvas, and put in a absolute position. The canvas is a drawing of the floors in my house, and each usercontrol has properties to indicate where in the house it is positioned. So I want all the controls to be positioned in the correct position on the canvas.

I'm thinking something like this

var light = new LightUserControl(2);
HouseCanvas.Children.Add(light); // this should be positioned in a specific place

From stackoverflow

• Add a StackPanel to the window and on each button click,

   _stackPanel.Children.Add(new YourControl());
  

  You can do this in many ways.

  Frode Lillerud : Thanks, the .Children property was the one I needed

  Micah : Please mark this response as answered.

• After you add the your control to the Canvas you need to specify the top and left co-ordinates using the Canvas.Top and Canvas.Left attached properties as follows.

  var light = new LightUserControl(2);
  HouseCanvas.Children.Add(light);
  Canvas.SetLeft(light, 20);
  Canvas.SetTop(light, 20);
  

  Guy Starbuck : This is perfect, thanks!

• In case you want to add the control to a Grid instead of a Canvas you can specify all the Grid properties through the Grid static class as follows:

  Label newLabel = new Label();
  label.Content = "New Element";
  Main.Children.Add(newLabel);
  Grid.SetColumn(newLabel, 0);
  Grid.SetRow(newLabel, 0);
  

  hughdbrown : This isn't necessarily what the original questioner wanted, but it was a help to me. Thanks.