EDIT****

Sorry I didn't see a way to delete this post. After talking with a colleague I think the problem is that I'm trying to force functionality on a XamTileControl that is not necessary. In other words my thinking was all wrong.

Has anyone had a problem wrapping a XamTilesControl with a scrollviewer and having your tiles shrink? If you drag the lower right corner of a tile to resize it and drag it a little bit then the tile/tiles will fill the XamTilesControl. If the scrollviewer is commented out then the tiles will fill the XamTilesControl without any user manipulation.

<UserControl x:Class="tmTilesContainer"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:SES_Tire_Analyzer"
             xmlns:igDP="http://infragistics.com/Tiles"
             mc:Ignorable="d"             
             d:DesignHeight="300" d:DesignWidth="300">
   
    <UserControl.Resources>
        <local:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
        <Style TargetType="{x:Type igDP:Tile}">
            <Setter Property="Row" Value="{Binding rowPosition}"/>
            <Setter Property="Column" Value="{Binding columnPosition}"/>
            <Setter Property="CloseButtonVisibility" Value="Visible"/>
            <Setter Property="CloseAction" Value="RemoveItem"/>
           
            <Setter Property="Visibility" Value="{Binding IsVisible, Converter={StaticResource BooleanToVisibilityConverter}}"/>
        </Style>
       
    </UserControl.Resources>


    <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
        <Grid Name="LayoutRoot">
            <igDP:XamTilesControl Name="xamTilesControl1" HeaderPath="Tag" ItemsSource="{Binding Charts}">
 
                <igDP:XamTilesControl.NormalModeSettings>
                    <igDP:NormalModeSettings TileLayoutOrder="UseExplicitRowColumnOnTile"
                                         AllowTileDragging="Swap"
                                         ShowAllTiles="False"
                                         ShouldAnimate="False"                                      
                                         HorizontalTileAreaAlignment="Stretch"
                                         VerticalTileAreaAlignment="Stretch"/>
                </igDP:XamTilesControl.NormalModeSettings>

                <igDP:XamTilesControl.ItemTemplate>
                    <DataTemplate>
                        <local:myUserControl/>
                    </DataTemplate>
                </igDP:XamTilesControl.ItemTemplate>


            </igDP:XamTilesControl>
        </Grid>
    </ScrollViewer>
</UserControl>

<UserControl x:Class="myUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300">
   
    <Border BorderBrush="Black" BorderThickness="10">
    <Grid Background="Yellow">
           
    </Grid>
    </Border>
</UserControl>