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    <p>In general just only apply the style where applicable. If you want implicit application use nested styles:</p> <pre><code>&lt;Style TargetType="{x:Type DataGrid}"&gt; &lt;Style.Resources&gt; &lt;Style TargetType="{x:Type TextBox}"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGridCell}}, Path=IsSelected}" Value="True"&gt; &lt;Setter Property="Foreground" Value="White" /&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Style.Resources&gt; &lt;/Style&gt; </code></pre> <p>If you have other parts which you want to apply to all TextBoxes take out those parts in a serarate style and use <a href="http://msdn.microsoft.com/en-us/library/system.windows.style.basedon.aspx" rel="nofollow"><code>BasedOn</code></a> in the style which applies to the TextBoxes inside the DataGrid.</p> <hr> <p><strong>Edit:</strong> MultiDataTrigger seems to return right away if a condition is not met so you can avoid binding errors:</p> <pre><code>&lt;Style TargetType="{x:Type TextBox}"&gt; &lt;Style.Resources&gt; &lt;vc:HasAncestorOfTypeConverter x:Key="HasAncestorOfTypeConverter" AncestorType="{x:Type DataGridCell}" /&gt; &lt;/Style.Resources&gt; &lt;Style.Triggers&gt; &lt;MultiDataTrigger&gt; &lt;MultiDataTrigger.Conditions&gt; &lt;Condition Binding="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource HasAncestorOfTypeConverter}}" Value="True" /&gt; &lt;Condition Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGridCell}}, Path=IsSelected}" Value="True" /&gt; &lt;/MultiDataTrigger.Conditions&gt; &lt;Setter Property="Foreground" Value="Red" /&gt; &lt;/MultiDataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <pre class="lang-cs prettyprint-override"><code>public class HasAncestorOfTypeConverter : IValueConverter { public Type AncestorType { get; set; } public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null) return false; DependencyObject current = value as DependencyObject; while (true) { current = VisualTreeHelper.GetParent(current); if (current == null) { return false; } if (current.GetType() == AncestorType) { return true; } } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotSupportedException(); } } </code></pre> <p>This of course causes quite som overhead so it might not be such a good solution, then again if the RelativeSource-binding fails it also had to go up the tree first.</p>
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    1. COThanks H.B. but this is getting set inside of a file that we have in our custom skin. Since there will be multiple skins that override this I was hoping to put all the TextBox style triggers in the same file and not have them split out - do you know of any way to solve what I am specifically asking (maybe by using a MultiTrigger and writing my own DataTrigger class or something)?
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      1. USMatt West
    2. CO@MattWest: A MultiDataTrigger might work, but only if the following condition is not evaluated if the first is negative, don't know if that is the case. (Is the problem the output message or just that the binding fails? The message could be knocked out)
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    3. COThe output message is the main problem - how do I knock that out?
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