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    <p>I found the reason of this behavior - it’s by design:</p> <p>If the Content of ContentControl is already a WPF-Element, it is <strong>created before using it in the ContenPresenter</strong>. The logical <strong>parent</strong> of the element <strong>is</strong> therefore <strong>ContentControl</strong>. I can check this through changing the ContentControl-markup to the following:</p> <pre><code>&lt;ContentControl Template="{StaticResource Test}" TextBlock.FontSize="50"&gt; &lt;TextBlock&gt; This text now is shown with a size of 50 &lt;/TextBlock&gt; &lt;/ContentControl&gt; </code></pre> <p>In this example the text size is 50 as desired. I can prove this argumentation also with wpf-visualizer of visual studio. The parent is ContentControl and through dp-inheritance, the FontSize is taken from the parent (ContentControl), and the text is shown with a size of 50!</p> <p><strong>Another behavior</strong> can be observed if the ContentControl contains only text as content:</p> <pre><code>&lt;Window.Resources&gt; &lt;ControlTemplate x:Key="Test" TargetType="{x:Type ContentControl}"&gt; &lt;ContentPresenter TextBlock.FontSize="50"/&gt; &lt;/ControlTemplate&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;ContentControl Template="{StaticResource Test}"&gt; This text is shown with a size of 50 &lt;/ContentControl&gt; &lt;/Grid&gt; </code></pre> <p>In this scenario, the <strong>TextBox</strong> is <strong>created through the ContentPresenter</strong> because text cannot be entered in the visual tree. The textbox has no parent but the TemplateParent-property leads to the ContentPresenter as the TextBoxes parent and the DP-system takes the FontSize-value through attached dependency property inheritance from the ContentPresenter. That’s why in this scenario the font size is changed to 50. </p> <p>The different scenarios are described <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.contentpresenter.aspx" rel="noreferrer">here</a>.</p> <p>What I don’t understand is, why VS2010 shows the FontSize 50 before compiling.</p>
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