private void FontProp_Click(object sender, EventArgs e) { if (sender == btnBold) { ActiveChild.SetFontStyle(FontStyle.Bold); } else if (sender == btnItalic) { ActiveChild.SetFontStyle(FontStyle.Italic); } else if (sender == btnUnderLined) { ActiveChild.SetFontStyle(FontStyle.Underline); } else if (sender == btnStrikeLined) { ActiveChild.SetFontStyle(FontStyle.Strikeout); } else if (sender == btnFondSizeIncrease) { ShowFontSize(ActiveChild.SetFontSize(true).ToString()); } else if (sender == btnFindSizeDecrease) { ShowFontSize(ActiveChild.SetFontSize(false).ToString()); } else { throw new NotImplementedException(); } }