WPF set border background in trigger

Question

I need to create a trigger, that will change Border background property, when MouseEnter occurred. I did the follow:

Answer 1

Common mistake. You have set the Border.Background property directly which will always override the value set by your trigger. (Locally set values have a very high precedence, style has a pretty low precedence.)

Instead, you should move your "normal" background into the Style like so:

<Border>
    <Border.Style>
        <Style TargetType="Border">
            <Setter Property="Background">
                <Setter.Value>
                    <LinearGradientBrush>
                        <LinearGradientBrush.GradientStops>
                            <GradientStop Color="Aquamarine" Offset="0"/>
                        </LinearGradientBrush.GradientStops>
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <!-- the trigger you showed -->
            </Style.Triggers>
        </Style>
    </Border.Style>
</Border>