Instancing a Control Outside of Main Window Visual Tree

[DJGosnell]

Is there a manual way to instance a UserControl, measure it, arrange it and then use DrawingContextHelper.RenderAsync to render the visuals another canvas context without attaching the UserControl directly to a Window? I can instance the UserControl just fine with content, but the VisualChildren is then empty. I see Logical descendants, but no VisualChildren. I believe that the visual children all need to be Measured and Arranged before I can use DrawingContextHelper.RenderAsync to render them to another canvas.

var uc = new UserControl() {
   Content = new TextBox() {
      Text = "TEST"
   }
};

uc.InitializeComponent();
uc.ApplyTemplate();
uc.Measure(Size.Infinity);
uc.Arrange(new Rect(uc.DesiredSize));

// This is always empty
uc.GetVisualChildren();

What is the proper way to instance a control?

If there is no way to do this, then that is something I need to know.

[maxkatz6]

You should be able to create a simple Window without showing it, to be able to render content. It will work as an actual root for your control.

[DJGosnell]

That's a great idea. Thank you.