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copied!<p>The <code>DataGridColumns</code> that derive from <code>DataGridBoundColumn</code> (all except <code>DataGridTemplateColumn</code>) has a property <code>ElementStyle</code> that is applied to the <code>TextBlock</code> when it is created. For e.g. <code>DataGridTextColumn</code> It looks like this</p> <pre><code>static DataGridTextColumn() { ElementStyleProperty.OverrideMetadata(typeof(DataGridTextColumn), new FrameworkPropertyMetadata(DefaultElementStyle)); // ... } </code></pre> <p>It overrides the metadata for <code>ElementStyle</code> and provides a new default value, <code>DefaultElementStyle</code>, which basically just sets the default margin for the <code>TextBlock</code>. </p> <pre><code>public static Style DefaultElementStyle { get { if (_defaultElementStyle == null) { Style style = new Style(typeof(TextBlock)); // Use the same margin used on the TextBox to provide space for the caret style.Setters.Add(new Setter(TextBlock.MarginProperty, new Thickness(2.0, 0.0, 2.0, 0.0))); style.Seal(); _defaultElementStyle = style; } return _defaultElementStyle; } } </code></pre> <p>This style is set in code everytime a new <code>DataGridCell</code> is created with <code>element.Style = style;</code> and this is overriding the Style you are trying to set, even if you try to set it implicitly.</p> <p>As far as I know, you'll have to repeat this for your columns</p> <pre><code><DataGridTextColumn Header="Column 1" ElementStyle="{StaticResource BoldCellStyle}" .../> <DataGridTextColumn Header="Column 2" ElementStyle="{StaticResource BoldCellStyle}" .../> </code></pre>

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