WPF GridViewHeader styling questions

Answer 1

I figured out my issues. The problem was that the column header acted like a button, so a new template had to be applied. Changing it to a TextBlock removed all of those issues.

<Style x:Key="GridHeaderCenter" TargetType="{x:Type GridViewColumnHeader}">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
                            <TextBlock Text="{TemplateBinding Content}" Padding="5" Width="{TemplateBinding Width}" TextAlignment="Center">
                                <TextBlock.Background>
                                    <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                        <GradientStop Offset="0.0" Color="#373638" />
                                        <GradientStop Offset="1.0" Color="#77797B" />
                                    </LinearGradientBrush>
                                </TextBlock.Background>
                            </TextBlock>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
                <Setter Property="OverridesDefaultStyle" Value="True" />
                <Setter Property="Background" Value="Green" />
                <Setter Property="Foreground" Value="White" />
                <Setter Property="FontSize" Value="12" />
                <Setter Property="Background">
                    <Setter.Value>
                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                            <GradientStop Offset="0.0" Color="#373638" />
                            <GradientStop Offset="1.0" Color="#77797B" />
                        </LinearGradientBrush>
                    </Setter.Value>
                </Setter>
            </Style>

<GridViewColumn Width="100" HeaderContainerStyle="{ StaticResource GridHeaderCenter}" Header="Transfer">