private void OKButton_Click(object sender, RoutedEventArgs args)
        {
            // Unfocus parameter name TextBox to have its changes updated
            OKButton.Focus();

            string textKey = TextKeyText.Text != null?TextKeyText.Text.Trim() : "";

            // Validate the entered text key
            string errorMessage;

            if (!TextKeyViewModel.ValidateName(textKey, out errorMessage))
            {
                App.WarningMessage(Tx.T("msg.invalid text key entered", "msg", errorMessage));
                TextKeyText.Focus();
                return;
            }

            string colonSuffix       = null;
            string translationString = TranslationText.Text;

            if (SourceCSharpButton.IsChecked == true && AddColonCheckbox.IsChecked == true)
            {
                var match = Regex.Match(parsedText, @"^(.+?)\s*:(\s*)$");
                if (match.Success)
                {
                    translationString = match.Groups[1].Value;
                    colonSuffix       = match.Groups[2].Value;
                }
            }

            // Check if the text key already exists but the translated text is different
            TextKeyViewModel existingTextKeyVM;

            if (MainViewModel.Instance.TextKeys.TryGetValue(textKey, out existingTextKeyVM))
            {
                if (translationString != existingTextKeyVM.CultureTextVMs[0].Text)
                {
                    TaskDialogResult result = TaskDialog.Show(
                        owner: this,
                        allowDialogCancellation: true,
                        title: "TxEditor",
                        mainInstruction: Tx.T("window.wizard.text key exists", "key", Tx.Q(textKey)),
                        content: Tx.T("window.wizard.text key exists.content"),
                        customButtons: new string[] { Tx.T("task dialog.button.overwrite"), Tx.T("task dialog.button.cancel") });
                    if (result.CustomButtonResult != 0)
                    {
                        TextKeyText.Focus();
                        return;
                    }
                }
            }

            // Backup current clipboard content
            ClipboardBackup = ClipboardHelper.GetDataObject();

            // Build the text to paste back into the source document, depending on the selected code
            // language
            if (SourceCSharpButton.IsChecked == true && SourceHtmlButton.IsChecked != true)
            {
                App.Settings.Wizard.SourceCode = "C#";

                string keyString = textKey.Replace("\\", "\\\\").Replace("\"", "\\\"");

                StringBuilder codeSb = new StringBuilder();
                if (isPartialString)
                {
                    codeSb.Append("\" + ");
                }
                codeSb.Append("Tx.T");
                if (AddColonCheckbox.IsChecked == true)
                {
                    codeSb.Append("C");
                }
                codeSb.Append("(\"" + keyString + "\"");
                var countPlaceholder = placeholders.FirstOrDefault(p => p.Name == "#");
                if (countPlaceholder != null)
                {
                    codeSb.Append(", ");
                    codeSb.Append(countPlaceholder.Code);
                }
                foreach (var pd in placeholders)
                {
                    if (pd == countPlaceholder)
                    {
                        continue;                                               // Already processed
                    }
                    if (string.IsNullOrWhiteSpace(pd.Name))
                    {
                        continue;                                                           // Not used anymore
                    }
                    codeSb.Append(", \"" + pd.Name.Replace("\\", "\\\\").Replace("\"", "\\\"") + "\"");
                    codeSb.Append(", ");
                    if (pd.IsQuoted)
                    {
                        codeSb.Append("Tx.Q(");
                    }
                    codeSb.Append(pd.Code);
                    if (pd.IsQuoted)
                    {
                        codeSb.Append(")");
                    }
                }
                codeSb.Append(")");
                if (isPartialString)
                {
                    codeSb.Append(" + \"");
                    if (!string.IsNullOrEmpty(colonSuffix))
                    {
                        codeSb.Append(colonSuffix);
                    }
                }
                else if (!string.IsNullOrEmpty(colonSuffix))
                {
                    codeSb.Append(" + \"");
                    codeSb.Append(colonSuffix);
                    codeSb.Append("\"");
                }
                Clipboard.SetText(codeSb.ToString());
            }
            if (SourceHtmlButton.IsChecked == true && SourceCSharpButton.IsChecked == true)
            {
                App.Settings.Wizard.SourceCode = "cshtml";

                string keyString = textKey.Replace("\\", "\\\\").Replace("\"", "\\\"");

                StringBuilder codeSb = new StringBuilder();
                codeSb.Append("@Tx.T");
                if (AddColonCheckbox.IsChecked == true)
                {
                    codeSb.Append("C");
                }
                codeSb.Append("(\"" + keyString + "\")");
                if (!string.IsNullOrEmpty(colonSuffix))
                {
                    codeSb.Append(colonSuffix);
                }
                Clipboard.SetText(codeSb.ToString());
            }
            if (SourceXamlButton.IsChecked == true)
            {
                App.Settings.Wizard.SourceCode = "XAML";

                string keyString     = textKey.Replace("\\", "\\\\").Replace("'", "\\'");
                string defaultString = translationString.Replace("\\", "\\\\").Replace("'", "\\'");

                string code = "{Tx:T '" + keyString + "'";
                if (SetDefaultCheckbox.IsChecked == true)
                {
                    code += ", Default='" + defaultString + "'";
                }
                code += "}";
                Clipboard.SetText(code);
            }
            if (SourceAspxButton.IsChecked == true)
            {
                App.Settings.Wizard.SourceCode = "aspx";

                string keyString = textKey.Replace("\\", "\\\\").Replace("\"", "\\\"");

                StringBuilder codeSb = new StringBuilder();
                codeSb.Append("<%= Tx.T(\"" + keyString + "\") %>");
                Clipboard.SetText(codeSb.ToString());
            }

            // Remember the text key for next time and close the wizard dialog window
            prevTextKey          = textKey;
            TranslationText.Text = translationString;
            DialogResult         = true;
            Close();
        }