title: Knowing the point location of the caret in a Winforms TextBox?
body: <p>I need to know the exact point location in my window where the caret currently resides so that I can pop up a small window under the text (similar to intellisense or a spellchecker).  The issue is that GetPositionFromCharIndex doesn't seem to work on TextBoxes.  This is what I'm trying to do:</p>
  
  <pre><code>Point pt = mTextBox.GetPositionFromCharIndex(mTextBox.SelectionStart);
  pt.Y = (int)Math.Ceiling(mTextBox.Font.GetHeight());
  mListBox.Location = pt;
  </code></pre>
  
  <p>However, GetPositionFromCharIndex always returns (0, 0) for TextBoxes (apparently it isn't implemented like it is for RichTextBox).  While this function (and this code) works fine for RichTextBoxes, I don't want to migrate the rest of my code from TextBox to RichTextBox except as an absolute <strong>LAST</strong> resort.  There are so many incompatibilities with RichTextBox/TextBox that I'll have to rewrite a <em>very</em> large chunk of my code to do this.</p>
  
  <p>Are there any Winforms wizards out there who know how to do this?</p>