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copied!<p>The reason why you aren't able to set the value in a <code>Style</code> is because you are setting a local value in your constructor. <a href="http://msdn.microsoft.com/en-us/library/ms743230.aspx" rel="nofollow">MSDN explains <code>DependencyProperty</code> value precedence in more detail</a>.</p> <p>Because you just want to give your property a default value per instance, just use <a href="http://msdn.microsoft.com/en-us/library/system.windows.dependencyobject.setcurrentvalue.aspx" rel="nofollow"><code>SetCurrentValue</code></a> instead of <code>SetValue</code> in your constructor.</p> <p><strong>Edit to explain this further</strong></p> <p>So, a <code>DependencyProperty</code> can be set in multiple ways. It can be set through code, a <code>Binding</code>, a <code>Style</code>, a <code>Trigger</code>, an <code>Animation</code>, or a few other ways. The important thing to know is that there can be multiple attempts to set a given property. </p> <p>Because of this, WPF has defined a precedence for the values. That means if you set a property in a <code>Style</code>, you can set the property manually to override the <code>Style</code> value. Or a <code>Trigger</code> in the <code>ControlTemplate</code> can override the <code>Style</code> value.</p> <p>When you set the property in your constructor, you are giving it a <em>local value</em>. From the first link, you will see that <strong>only</strong> an <code>Animation</code> or <code>Property Coercion</code> can override a local value. </p> <p>The <code>SetCurrentValue</code> method, however, will allow you to set a value for a property <a href="http://msdn.microsoft.com/en-us/library/ms743230.aspx#setcurrentvalue" rel="nofollow"><em>without setting a local value</em></a>. This is what you need, as you want to be able to set the value in a <code>Style</code>.</p>

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