Hello,

In order to do this you will have to focus on the TilePaneFillKey brush which is the default brush for the header and can be located in DefaultStyle\XamWebTileView.xaml

<!--TilePane Background-->
<LinearGradientBrush x:Key="TilePaneFillKey" StartPoint="0.5,0" EndPoint="0.5,1">
            <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Offset="0" Color="Red"/>
                    <GradientStop Offset="1" Color="White"/>
                </GradientStopCollection>
            </LinearGradientBrush.GradientStops>
</LinearGradientBrush>

You can create a style for the TilePane as a resource and then set it for all the panes using the code below:

<ig:XamWebTileView.DefaultItemsContainer>
                <DataTemplate>
                       <ig:TilePane Style="{StaticResource TilePaneCustomStyle1}" />
                </DataTemplate>
 </ig:XamWebTileView.DefaultItemsContainer>

or set it to particular TilePane:

<igTileView:TilePane Style="{StaticResource TilePaneCustomStyle1}"/>

Let me know if you have any questions with this matter.

Vlad