How do you style a WPF GridView Header?

Answer 1

Have a look at the GridViewColumnHeader.Role property. The sample in the documentation for the GridViewColumnHeaderRole enumeration might give you some ideas...

EDIT: Have you considered using the GridView.HeaderStyle property ?

Answer 2

I solved this issue but I think there should be a better way of doing it. The problem was that I had TextBlocks on the header of each column. The unused area didn't have anything on the header row. I just added a TextBlock with the same background in the GridView.ColumnHeaderContainerStyle and it happened to span the rest of the unused width of the grid.

<GridView.ColumnHeaderContainerStyle>
    <Style TargetType="GridViewColumnHeader">
     <Setter Property="Template">
      <Setter.Value>
       <ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
        <TextBlock Text="" Padding="5">
         <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>
    </Style>
</GridView.ColumnHeaderContainerStyle>