void cmdListAllUnicodes_Click(object sender, EventArgs e)
{
List <uint> unicodes = new List <uint>();
_selectedTypeface.CollectUnicode(unicodes);
//show in list in hex
lstUnicodes.Items.Clear();
foreach (uint u in unicodes)
{
lstUnicodes.Items.Add(String.Format("{0:X}", u).ToLower());
}
}