Setting Image in MenuItem Header From Code

<menuitem.header>
    <Image Source="/Assembly;component/Resources/Images/Img.png"
           Margin="-3,-1,0,0"
           Stretch="None" />
</menuitem.header>

var headerMenuIcon = new FrameworkElementFactory(typeof(Image));

headerMenuIcon.SetValue(Image.SourceProperty, new BitmapImage(new Uri("Resources/Images/Img.png", UriKind.Relative)));

var headerMenuItem = new FrameworkElementFactory(typeof(MenuItem));

headerMenuItem.SetValue(MenuItem.HeaderProperty, headerMenuIcon);