/// <summary>
/// Sets the <see cref="Visual.CenterPoint"/> property of the <see cref="Visual"/> behind a given <see cref="FrameworkElement"/>
/// </summary>
/// <param name="element">The source <see cref="FrameworkElement"/></param>
/// <param name="x">The center to use on the X axis. If <see langword="null"/>, the center of the <see cref="FrameworkElement"/> will be used</param>
/// <param name="y">The center to use on the Y axis. If <see langword="null"/>, the center of the <see cref="FrameworkElement"/> will be used</param>
public static void SetVisualCenterPoint(this FrameworkElement element, double?x, double?y)
{
if (double.IsNaN(element.Width) || double.IsNaN(element.Height))
{
throw new InvalidOperationException("The target element must have a fixed size");
}
element.GetVisual().CenterPoint = new Vector3((float?)x ?? (float)(element.Width / 2), (float?)y ?? (float)(element.Height / 2), 0);
}