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    <p>Typography in general and fonts in particular are a fairly complex topic I'm not really into. That said here's what I've figured from <a href="http://msdn.microsoft.com/en-us/library/ms742190.aspx" rel="nofollow noreferrer">Typography in Windows Presentation Foundation</a> and related MSDN documentation:</p> <ul> <li>Text is rendered by means of a text rendering pipeline (see link above for a diagram).</li> <li>WPF facilitates OpenType as an extension of the TrueType font format. <ul> <li>The <a href="http://msdn.microsoft.com/en-us/library/system.windows.documents.typography.aspx" rel="nofollow noreferrer"><code>Typography</code></a> object exposes many of the advanced features of OpenType fonts.</li> </ul></li> <li>An important low level text rendering concept is the <code>Glyphs</code> element, see MSDN <a href="http://msdn.microsoft.com/en-us/library/ms748985.aspx" rel="nofollow noreferrer">introduction</a>.</li> </ul> <p>If you look at the mentioned text rendering pipeline diagram you'll notice that while glyphs are the building blocks they may be acted upon in various ways (filtered/transformed/...) before finally getting displayed on a particular medium, e.g. a screen or a printer; one example would be applying ClearType for LCD screens. However, as usually with pipelining concepts, those transformations are more ore less optional in general.</p> <p>Now, depending on your application requirements, this might already yield a solution. If you don't really need a TextBox you might as well just use Glyphs in itself like so:</p> <pre><code>&lt;Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" &gt; &lt;Grid&gt; &lt;TextBox Text="TextBox: 1234567890" FontFamily="Scramble" FontSize="12" /&gt; &lt;Glyphs UnicodeString="Glyphs: 1234567890" FontUri="C:\WINDOWS\Fonts\Scramble.TTF" FontRenderingEmSize="12" Fill="Black" OriginX="5" OriginY="32"/&gt; &lt;/Grid&gt; &lt;/Page&gt; </code></pre> <p>The Glyphs element is rendering empty tiles for numbers as desired while the TextBox element does not. Please note that due to Glyphs being a low level element, several restrictions apply, especially FontUri/Fill/FontRenderingEmSize are all required, i.e. there are no defaults like for the related TextBox properties.</p> <p>With all this in mind back to your original question: I wouldn't think of the problem at hand as a WPF limitation (or a bug even), rather of an effect regarding the text rendering requirements and defaults applied in the context of WPF UI layout. E.g. the composite (i.e. non low level) <code>TextBox</code> control is applying text formatting and typography settings to its content (glyphs), facilitating the various character mapping tables embedded in fonts (there are potentially <a href="http://www.microsoft.com/typography/otspec/otff.htm#otttables" rel="nofollow noreferrer">lots</a> of them...); special/simplistic fonts like Scramble might just not provide enough or correct information here, consequently the WPF rendering engine might be forced to apply font fallback as <a href="https://stackoverflow.com/questions/832470/wpf-font-why-are-some-characters-missing/1087947#1087947">outlined by GalacticCowboy</a> already.</p> <p>If that's indeed the case, it might be possible to override the WPF default rendering algorithm somehow (see class <a href="http://msdn.microsoft.com/en-us/library/system.windows.media.textformatting.textformatter.aspx" rel="nofollow noreferrer"><code>TextFormatter</code></a>, the WPF text engine), but likely one would need to dig pretty deep into the framework to figure out what's going on within a <code>TextBox</code>. It's probably much easier to 'debug' the eventually missing or incorrect character mappings within the Scramble font. This would be an entirely different endeavor though...</p>
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