Tricky styling issues in WPF

For about the last 8 or 9 hours (spread across two days) I've been troubleshooting a styling issue in WPF. I have a list of items that I'm displaying in a ListBox that have an 'enabled' property, which is an enum with values OFF and ON. Understand that this type was generated from an XML schema which is very tightly controlled, hence why the type is not a boolean (as would make sense with a name like 'enabled'). I've been trying to create a DataTemplate for the ListBoxItems so that they'll each have an icon associated with them depending on whether they're enabled or not. My original list looked like this :

<ListBox x:Name="ProcedureList" ItemsSource="{Binding Path=procedure}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
  <ListBox.Resources>
    <Style TargetType="{x:Type ListBoxItem}">
      <EventSetter Event="MouseDoubleClick" Handler="WeldProcedure_MouseDoubleClick" />
      <Setter Property="HorizontalContentAlignment" Value="Stretch" />
    </Style>
    <Style TargetType="{x:Type Image}">
      <Style.Triggers>
        <DataTrigger Binding="{Binding}" Value="OFF">
          <Setter Property="Image.Source" Value="Resources/Error_16x16_72.png"/>
        </DataTrigger>
        <DataTrigger Binding="{Binding}" Value="ON">
          <Setter Property="Image.Source" Value="Resources/Success_16x16_72.png"/>
        </DataTrigger>
      </Style.Triggers>
    </Style>
  </ListBox.Resources>
  <ListBox.ItemTemplate>
    <DataTemplate DataType="{x:Type model:WeldingProcedure}">
      <DockPanel HorizontalAlignment="Stretch" LastChildFill="True">
        <Image DockPanel.Dock="Right" Height="16" Width="16" DataContext="{Binding Path=enabled}" ToolTip="Disabled"/>
        <TextBlock DockPanel.Dock="Left" VerticalAlignment="Center" TextAlignment="Left" Text="{Binding Path=procedureName}"/>
      </DockPanel>
    </DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

However, the images in the DataTemplate were not getting styled with the images as they should have been. As it turns out, if you're referencing default styles in Templates as above, the style resolution doesn't go outside of the template, so the default styling for all Image elements as above needs to go *inside* the DataTemplate resources :

<ListBox x:Name="ProcedureList" ItemsSource="{Binding Path=procedure}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
  <ListBox.Resources>
    <Style TargetType="{x:Type ListBoxItem}">
      <EventSetter Event="MouseDoubleClick" Handler="WeldProcedure_MouseDoubleClick" />
      <Setter Property="HorizontalContentAlignment" Value="Stretch" />
    </Style>
  </ListBox.Resources>
  <ListBox.ItemTemplate>
    <DataTemplate DataType="{x:Type model:WeldingProcedure}">
      <DataTemplate.Resources>
        <Style TargetType="{x:Type Image}">
          <Style.Triggers>
            <DataTrigger Binding="{Binding}" Value="OFF">
              <Setter Property="Image.Source" Value="Resources/Error_16x16_72.png"/>
            </DataTrigger>
            <DataTrigger Binding="{Binding}" Value="ON">
              <Setter Property="Image.Source" Value="Resources/Success_16x16_72.png"/>
            </DataTrigger>
          </Style.Triggers>
        </Style>
      </DataTemplate.Resources>
      <DockPanel HorizontalAlignment="Stretch" LastChildFill="True">
        <Image DockPanel.Dock="Right" Height="16" Width="16" DataContext="{Binding Path=enabled}" ToolTip="Disabled"/>
        <TextBlock DockPanel.Dock="Left" VerticalAlignment="Center" TextAlignment="Left" Text="{Binding Path=procedureName}"/>
      </DockPanel>
    </DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

Fixing package retrieval quirks in Ubuntu Gutsy Gibbon Server

In the default installation of Ubuntu Server (Gutsy Gibbon), the default source of packages is the CD-ROM drive. That's fine if you make the assumption that there will always be somebody physically present in order to maintain the servers, but for most server's these days, that's a fallacious assumption. The really bad part about this default, is that there's no way I know of at the time of this writing to override this on the update command. In our company, we have our servers hosted off-site like so many other companies, so everything must be done remotely. Therefore, the CD-ROM as a source for Ubuntu packages is a bad idea. To remedy this, you have to go into the apt-get configuration stored at

/etc/apt/sources.list

, and you'll have to find a line similar to :

deb cdrom:[Ubuntu-Server 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ gutsy main restricted

Comment out this line, try your update again and you should be good to go.