I used the latest Blend preview to create a style for the slider. When I run the application, the slider is always disabled. As soon as a remove the custom style, it is enabled again. I cannot see why this would be happening.
Template code generated by Blend is below:
<Style x:Key="SliderStyle1" TargetType="Slider">
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Maximum" Value="10"/>
<Setter Property="Minimum" Value="0"/>
<Setter Property="Value" Value="0"/>
<Setter Property="BorderBrush">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFA3AEB9" Offset="0"/>
<GradientStop Color="#FF8399A9" Offset="0.375"/>
<GradientStop Color="#FF718597" Offset="0.375"/>
<GradientStop Color="#FF617584" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Slider">
<Grid x:Name="Root">
<Grid.Resources>
<ControlTemplate x:Key="RepeatButtonTemplate">
<Grid x:Name="Root" Background="Transparent" Opacity="0"/>
</ControlTemplate>
</Grid.Resources>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="HorizontalTrackRectangleDisabledOverlay">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ThumbDisabledOverlay">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="VerticalTrackRectangleDisabledOverlay">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid x:Name="HorizontalTemplate" Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Rectangle x:Name="TrackRectangle" Grid.ColumnSpan="3" Grid.Column="0" Fill="#FFE6EFF7" Height="3" Margin="5,0,5,0" RadiusY="1" RadiusX="1" Stroke="#FFA3AEB9" StrokeThickness="{TemplateBinding BorderThickness}"/>
<Rectangle x:Name="HorizontalTrackRectangleDisabledOverlay" Grid.ColumnSpan="3" Grid.Column="0" Fill="White" Height="3" Margin="5,0,5,0" Opacity=".55" RadiusY="1" RadiusX="1" Visibility="Collapsed"/>
<RepeatButton x:Name="HorizontalTrackLargeChangeDecreaseRepeatButton" Grid.Column="0" Height="18" IsTabStop="False" Template="{StaticResource RepeatButtonTemplate}"/>
<Thumb x:Name="HorizontalThumb" Grid.Column="1" Height="18" IsTabStop="True" Width="11"/>
<Rectangle x:Name="ThumbDisabledOverlay" Grid.Column="1" Fill="White" Opacity=".55" RadiusY="2" RadiusX="2" Visibility="Collapsed" Width="11"/>
<RepeatButton x:Name="HorizontalTrackLargeChangeIncreaseRepeatButton" Grid.Column="2" Height="18" IsTabStop="False" Template="{StaticResource RepeatButtonTemplate}"/>
</Grid>
<Grid x:Name="VerticalTemplate" Background="{TemplateBinding Background}" Visibility="Collapsed">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Rectangle Fill="#FFE6EFF7" Margin="0,5,0,5" RadiusY="1" Grid.Row="0" RadiusX="1" Grid.RowSpan="3" Stroke="#FFA3AEB9" StrokeThickness="{TemplateBinding BorderThickness}" Width="3"/>
<Rectangle x:Name="VerticalTrackRectangleDisabledOverlay" Fill="White" Margin="0,5,0,5" Opacity=".55" RadiusY="1" Grid.Row="0" RadiusX="1" Grid.RowSpan="3" Visibility="Collapsed" Width="3"/>
<RepeatButton x:Name="VerticalTrackLargeChangeDecreaseRepeatButton" IsTabStop="False" Grid.Row="2" Template="{StaticResource RepeatButtonTemplate}" Width="18"/>
<Thumb x:Name="VerticalThumb" Height="11" IsTabStop="True" Grid.Row="1" Width="18"/>
<RepeatButton x:Name="VerticalTrackLargeChangeIncreaseRepeatButton" IsTabStop="False" Grid.Row="0" Template="{StaticResource RepeatButtonTemplate}" Width="18"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Some of the Silverlight control templates work in WPF, while others do not. Slider is one of those controls.