private void CreateMainImage()
{
_mainImage = new Image();
_mainImage.Name = "ImageHolder";
_mainImage.Stretch = System.Windows.Media.Stretch.Fill;
_mainCanvas.Children.Add(_mainImage);
DynamicCanvas.SetTop(_mainImage, _border);
DynamicCanvas.SetLeft(_mainImage, _border);
DynamicCanvas.SetZIndex(_mainImage, -500);
}