Changing the ImageElement texture in a menu dynamically from script

[Idomeneas1970]

In order to access the texture of the ImageElement in your menu script and change it from code at runtime, try the following:
...

private ImageElement PreviewImage;

public override void Start()
{
var page = Entity.Get<UIComponent>().Page;
//PreviewImageHolder is the Name under Misc in the property grid in the UI GUI
PreviewImage = page.RootElement.FindVisualChildOfType<ImageElement>("PreviewImageHolder");
...
}
Then if you press a button in your menu, you can load a new texture from disc and update at runtime; for example:

private void ButtonClickedGenerate(object sender, RoutedEventArgs e)
{
.....
//point to an existing file you've made by other means
            string assemblyPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            string filename = AppContext.BaseDirectory+"Resources\" + FileNameEditText.Text + ".bmp";
             Texture texture; 
//read the file in as texture
             using (var inStream = System.IO.File.OpenRead(filename))
                   texture = Texture.Load(Game.GraphicsDevice, inStream, loadAsSRGB: true);
//tricky part is here. if you go through the code, it might appear that you cannot change the Source property
//but this worked
             PreviewImage.Source.GetSprite().Texture = texture;
...
}

I hope it helps someone. It appears to me that if you can get somehow the object of interest in a scene or menu, you can change pretty much any of the properties, which is pretty awesome.
Thanks