I have a global textblock style set at the app level so all textblocks will inherit the style (unless overridden).

 I also have a style for the xamDataGrid header row for background etc. When I set the foreground, font size, etc it is not taking but is taking the app level textblock style. How can I stop infragistics wpf controls from doing this? Having same issue now with xamMaskedEditor.

 Hope that makes since.

<StackPanel>
        <StackPanel.Resources>
            <Style TargetType="{x:Type TextBlock}">
                <Setter Property="FontSize"
                        Value="22" />
                <Setter Property="Foreground"
                        Value="Red" />
            </Style>
        </StackPanel.Resources>

        <igEditors:XamMaskedEditor Text="37128"
                                   Mask="nnnnn">
            <igEditors:XamMaskedEditor.Style>
                <Style TargetType="{x:Type igEditors:XamMaskedEditor}">
                    <Setter Property="Foreground"
                            Value="Blue" />
                </Style>
            </igEditors:XamMaskedEditor.Style>
        </igEditors:XamMaskedEditor>
        <TextBlock Text="This is a test" />
        <TextBlock Text="This is a test overiding inherited style">
            <TextBlock.Style>
                <Style TargetType="{x:Type TextBlock}">
                    <Setter Property="Foreground"
                            Value="Blue" />
                </Style>
            </TextBlock.Style>
        </TextBlock>

    </StackPanel>