private bool ReplaceText(string textToInsert)
    {
        bool retval = false;

        Microsoft.Office.Interop.Word.Selection currentSelection = Globals.ThisAddIn.Application.Selection;

        // if (currentSelection.ContainsTrailingParagraphMark)
        // {
        //    retval = true;
        // }

        currentSelection.Range.Text = textToInsert;
        currentSelection.EndKey(WdUnits.wdStory);

        return retval;
    }

    private void ObjButtonAddFoo_Click(object sender, RibbonControlEventArgs e)
    {
        if (ReplaceText("REPLACEMENT TEXT"))
        {
            Microsoft.Office.Interop.Word.Selection currentSelection = Globals.ThisAddIn.Application.Selection;
            currentSelection.TypeParagraph();
        }
    }

private bool ReplaceText(string textToInsert)
    {
        bool retval = false;

        Microsoft.Office.Interop.Word.Selection currentSelection = Globals.ThisAddIn.Application.Selection;

        // if (currentSelection.ContainsTrailingParagraphMark)
        // {
        //    retval = true;
        // }

        //Remove the paragraph mark from the range to preserve it
        object charUnit = Microsoft.Office.Interop.Word.WdUnits.wdCharacter;
        object move = -1;  // move left 1
        currentSelection.MoveEnd(ref charUnit, ref move);
        currentSelection.Range.Text = textToInsert;

        currentSelection.EndKey(WdUnits.wdStory);

        return retval;
    }