private void btnBold_Click(object sender, EventArgs e)
        {
            switch ((sender as ToolStripButton).Tag.ToString())
            {
            case "0":
                FHCView.ApplyTextStyle(HCFontStyle.tsBold);
                break;

            case "1":
                FHCView.ApplyTextStyle(HCFontStyle.tsItalic);
                break;

            case "2":
                FHCView.ApplyTextStyle(HCFontStyle.tsUnderline);
                break;

            case "3":
                FHCView.ApplyTextStyle(HCFontStyle.tsStrikeOut);
                break;

            case "4":
                FHCView.ApplyTextStyle(HCFontStyle.tsSuperscript);
                break;

            case "5":
                FHCView.ApplyTextStyle(HCFontStyle.tsSubscript);
                break;
            }
        }