WPF DataTemplate DataBound Data not showing on Trigger

Question

I'm having a very annoying problem with my datatemplates, the mouseOver template won't show any of the databound controls, so only the label and textbox are shown on mouseover. Theres no errors so I think I'm just missing something. The code - first one is used as a the Content Template when on MouseOver:

<!-- Data Template used when MouseOver triggered -->
    <DataTemplate x:Key="LibraryItem_MouseOver" DataType="{x:Type local:libraryItemObject}">
        <DataTemplate.Resources>
            <local:ImageConverter x:Key="imageConverter" />
            <local:NoInLibraryConverter x:Key="noInLibraryConverter" />
            <local:ProjectsUsedInConverter x:Key="projectsUsedInConverter" />
        </DataTemplate.Resources>

        <!-- Main content container -->
        <StackPanel Orientation="Horizontal">
            <Image Width="50" Height="20" Source="{Binding Path=ImageRef, 
                       Converter={StaticResource imageConverter}}" />
            <Label Content="{Binding Brand}" />
            <Label Content="{Binding Code}" />
            <Label Content="{Binding Path=ProjectsUsedIn, Converter={StaticResource projectsUsedInConverter}}" />
            <Label Content="{Binding Path=NoInLibrary, Converter={StaticResource noInLibraryConverter}}" />
            <Label Content="Number To Add:" />
            <TextBox Width="50" PreviewKeyUp="TextBox_PreviewKeyUp" Tag="{Binding Path=ProjectsUsedIn, Converter={StaticResource projectsUsedInConverter}}" />
        </StackPanel>
    </DataTemplate>

And this is the code for the second DataTemplate:

<DataTemplate DataType="{x:Type local:libraryItemObject}">
        <DataTemplate.Resources>
            <local:ImageConverter x:Key="imageConverter" />
            <local:NoInLibraryConverter x:Key="noInLibraryConverter" />
            <local:ProjectsUsedInConverter x:Key="projectsUsedInConverter" />
            <Style TargetType="Button">
                <Setter Property="OverridesDefaultStyle" Value="True"/>
                <Setter Property="Margin" Value="2"/>
                <Setter Property="FontFamily" Value="Verdana"/>
                <Setter Property="FontSize" Value="11px"/>
                <Setter Property="FontWeight" Value="Bold"/>
                <Setter Property="Background" >
                    <Setter.Value>
                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1" >
                            <GradientStop Color="#FFFFD190" Offset="0.2"/>
                            <GradientStop Color="Orange" Offset="0.85"/>
                            <GradientStop Color="#FFFFD190" Offset="1"/>
                        </LinearGradientBrush>
                    </Setter.Value>
                </Setter>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="Button">
                            <Border Name="border" 
                                  BorderThickness="1"
                                  Padding="4,2" 
                                  BorderBrush="DarkGray" 
                                  CornerRadius="3" 
                                  Background="{TemplateBinding Background}">
                                <Grid>
                                    <ContentPresenter HorizontalAlignment="Center" 
                                                          VerticalAlignment="Center">
                                        <ContentPresenter.RenderTransform>
                                            <TranslateTransform X="1.0" Y="1.0" />
                                        </ContentPresenter.RenderTransform>
                                    </ContentPresenter>
                                    <ContentPresenter HorizontalAlignment="Center" 
                                                          VerticalAlignment="Center" 
                                                          Name="content"/>
                                </Grid>
                            </Border>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsMouseOver" Value="True">
                                    <Setter TargetName="border" Property="BorderBrush" Value="#FF4788c8" />
                                    <Setter Property="Foreground" Value="#FF4788c8" />
                                    <Setter Property="ContentTemplate" Value="{StaticResource LibraryItem_MouseOver}" />
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </DataTemplate.Resources>
        <Button>
            <StackPanel Orientation="Horizontal">
                <Image Width="50" Height="20" Stretch="Fill"  Source="{Binding Path=ImageRef, 
                           Converter={StaticResource imageConverter}}" />
                <Label Content="{Binding Brand}" />
                <Label Content="{Binding Code}" />
                <Label Content="{Binding Path=ProjectsUsedIn, Converter={StaticResource projectsUsedInConverter}}" />
                <Label Content="{Binding Path=NoInLibrary, Converter={StaticResource noInLibraryConverter}}" />
            </StackPanel>
        </Button>
    </DataTemplate>

Any ideas what might be causing the problem? The types are both the same and the converters are specified for both, so I can't work out why the mouseOver data template isn't getting the source properly! Thanks, Becky