i am using pivot control, and i want to change the forground color of headers!

but somehow i am not able to do it with pretty easy guess !

```
 <Pivot x:Name="pivot1">
                <PivotItem x:Name="pivot1item1" Header="Profile" Style="{StaticResource PuzzlePivotItemHeader}">
                    <Controls:Profile />
                </PivotItem>
                <PivotItem x:Name="pivot1item2" Header="Filters" Style="{StaticResource PuzzlePivotItemHeader}">
                    <Controls:Filters />
                </PivotItem>
        </Pivot>

```

and style is : 

```
<Style x:Key="PuzzlePivotItemHeader" TargetType="PivotItem">
        <Setter Property="Foreground" Value="White"/>
    </Style>

```

i just want the header fontsize change and color as white !!

how could it possible?