C#

public class MyClass : IDisposable
{
    private MyNestedForm myNestedForm;

    public MyClass()
    {
        myNestedForm = new MyNestedForm();
    }

    public Font XYZFont
    {
        set { myNestedForm.XYZFont = value; }
    }

    public void Dispose()
    {
        myNestedForm.Dispose();
    }

    internal class MyNestedForm : Form
    {
        private Font xyzFont;

        public Font XYZFont
        {
            get
            {
                if(xyzFont==null)
                    return Control.DefaultFont;
                else
                    return xyzFont;
            }
            set { xyzFont = value; }
        }

        protected override void Dispose(bool disposing)
        {
            if (xyzFont != null)
                xyzFont.Dispose();
            base.Dispose(disposing);
        }
    }
}

((char)((int)'a' + new Random().Next(26))).ToString();