WPF issue with Trigger

I am trying to add a Trigger to a control template (for a button) and I am getting an error that says the target cannot be found. Here is a code snippet:

                <ControlTemplate TargetType="Button">
                    <Border x:Name="t"
                            Margin="{TemplateBinding Margin}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}">
                        <Border.Background>
                            <LinearGradientBrush StartPoint="0,0"
                                                 EndPoint="0,1">
                                <LinearGradientBrush.GradientStops>
                                    <GradientStop x:Name="BackgroundGradientStop1"
                                                  Offset="0"
                                                  Color="{StaticResource BackgroundColor1}" />
                                    <GradientStop x:Name="BackgroundGradientStop2"
                                                  Offset="1"
                                                  Color="{StaticResource BackgroundColor2}" />
                                </LinearGradientBrush.GradientStops>
                            </LinearGradientBrush>
                        </Border.Background>

                        <ContentPresenter Margin="{TemplateBinding Padding}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled"
                                 Value="False">
                            <Setter TargetName="BackgroundGradientStop1"
                                    Property="Color"
                                    Value="White" />
                        </Trigger>

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The name "BackgroundGradientStop1" in the Setter of the Trigger is reported as not found, however it is defined before that in the code just above. The same target name is used in MultiTriggers after this one and no error is reported.

What is wrong with my code?
Sid
Sid PriceSoftware Systems Architect/DesignerAsked:
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Sid PriceConnect With a Mentor Software Systems Architect/DesignerAuthor Commented:
I have discovered the issue with the above code from another source, The "BackgroundGradientStop1" element is NOT derived from FrameworkElement and therefore cannot be the target of a Setter.
Sid
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