More comments on this issue...
It seems like the overal width of the control is somehow involved in drawing the rightmost thumb - perhaps some division which results in a half pixel that gets rounded incorrectly...
<UserControl
x:Class="SilverlightApplication226.MainPage"
Width="Auto" Height="Auto">
<UserControl.Resources>
<Style x:Key="RadSliderStyle1" TargetType="telerik:RadSlider">
<!-- "Background" is used for the "Left Region" -->
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFD56365" Offset="0"/>
<GradientStop Color="#FFE5696B" Offset="0.13"/>
<GradientStop Color="#FFDC595B" Offset="0.339"/>
<GradientStop Color="#FFC7191D" Offset="0.6"/>
<GradientStop Color="#FFC1161A" Offset="0.665"/>
<GradientStop Color="#FF9E090D" Offset="0.917"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<!-- "Foreground" is used for the "Right Region" -->
<Setter Property="Foreground">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FF66C85D" Offset="0"/>
<GradientStop Color="#FF69D362" Offset="0.13"/>
<GradientStop Color="#FF58CF51" Offset="0.339"/>
<GradientStop Color="#FF0DAF03" Offset="0.6"/>
<GradientStop Color="#FF0EAE04" Offset="0.665"/>
<GradientStop Color="#FF158E0F" Offset="0.917"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="BorderBrush" Value="Transparent"/>
<Setter Property="TickTemplate">
<Setter.Value>
<DataTemplate>
<Rectangle Fill="#FF000000" Height="5" ToolTipService.ToolTip="{Binding}" Width="1"/>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="ThumbStyle">
<Setter.Value>
<Style TargetType="Thumb">
<Setter Property="Width" Value="20"/>
<Setter Property="Height" Value="18" />
<Setter Property="IsTabStop" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Thumb">
<Grid x:Name="root" Background="Transparent" Cursor="Hand">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="path_Inner" Storyboard.TargetProperty="Opacity" Duration="0:0:0.1" To="0.75" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed" />
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="root" Storyboard.TargetProperty="Opacity" Duration="0" To="0.55" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused" />
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid.RowDefinitions>
<RowDefinition Height="1*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Rectangle Grid.Row="0" Grid.Column="0" Fill="{TemplateBinding Background}" Margin="0,9,0,0" />
<Rectangle Grid.Row="0" Grid.Column="1" Fill="{TemplateBinding Foreground}" Margin="0,9,0,0" />
<Path x:Name="path_Outer" Grid.Row="0" Grid.RowSpan="1" Grid.Column="0" Grid.ColumnSpan="2" Stretch="Fill" Data="M0,0 L2,0 L2,1 L1,2 L0,1 z" Stroke="#FF799FBF" Fill="#FF1985DD" />
<Path x:Name="path_Inner" Grid.Row="0" Grid.RowSpan="1" Grid.Column="0" Grid.ColumnSpan="2" Stretch="Fill" Data="M0,0 L2,0 L2,1 L1,2 L0,1 z" Stroke="#FFFFFFFF" Margin="1">
<Path.Fill>
<RadialGradientBrush RadiusX="1.5" RadiusY="1.5" Center="0.5,0.5" GradientOrigin="0.5,0.5">
<GradientStop Color="#FFC9DBF0" Offset="0"/>
<GradientStop Color="#FF799FBF" Offset="1"/>
</RadialGradientBrush>
</Path.Fill>
</Path>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="SelectionMiddleThumbStyle">
<Setter.Value>
<Style TargetType="Thumb">
<Setter Property="IsTabStop" Value="True"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="BorderBrush" Value="Transparent"/>
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFF0E663" Offset="0.13"/>
<GradientStop Color="#FFAB9C00" Offset="0.917"/>
<GradientStop Color="#FFE3D75D" Offset="0.065"/>
<GradientStop Color="#FFD8C600" Offset="0.6"/>
<GradientStop Color="#FFEADD4B" Offset="0.339"/>
<GradientStop Color="#FFD3C100" Offset="0.665"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Thumb">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver" />
<VisualState x:Name="Pressed" />
<VisualState x:Name="Disabled" />
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused" />
<VisualState x:Name="Unfocused" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle Fill="{TemplateBinding Background}" Margin="0,9,0,11"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="TickBarStyle">
<Setter.Value>
<Style TargetType="telerik:RadTickBar">
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<Grid Background="Transparent"/>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="TrackStyle">
<Setter.Value>
<Style TargetType="ContentControl">
<Setter Property="Height" Value="6"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentControl">
<Rectangle Fill="Purple" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="IncreaseHandleStyle">
<Setter.Value>
<Style TargetType="RepeatButton">
<Setter Property="Width" Value="18"/>
<Setter Property="Height" Value="18"/>
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="IsTabStop" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="RepeatButton">
<Grid x:Name="Root">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver" />
<VisualState x:Name="Pressed" />
<VisualState x:Name="Disabled" />
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused" />
<VisualState x:Name="Unfocused" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="DecreaseHandleStyle">
<Setter.Value>
<Style TargetType="RepeatButton">
<Setter Property="Width" Value="18"/>
<Setter Property="Height" Value="18"/>
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="IsTabStop" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="RepeatButton">
<Grid x:Name="Root">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver" />
<VisualState x:Name="Pressed" />
<VisualState x:Name="Disabled" />
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused" />
<VisualState x:Name="Unfocused" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="telerik:RadSlider">
<Grid Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="OrientationStates">
<VisualState x:Name="Horizontal" />
<VisualState x:Name="Vertical" />
<VisualState x:Name="ReversedHorizontal" />
<VisualState x:Name="ReversedVertical" />
</VisualStateGroup>
<VisualStateGroup x:Name="TickPlacementStates">
<VisualState x:Name="NoneTicks">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="TopTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="BottomTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="TopTicks">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="TopTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="BottomTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="BottomTicks">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="TopTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="BottomTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="BothTicks">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="TopTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="BottomTickBar">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="RangeStates">
<VisualState x:Name="SingleThumb">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="RangeThumbsPanel">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="SingleThumbHost">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="RangeThumbs">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="RangeThumbsPanel">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="SingleThumbHost">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid UseLayoutRounding="True">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<telerik:RadTickBar x:Name="TopTickBar" Grid.ColumnSpan="3" Grid.Column="1" ItemTemplate="{TemplateBinding TickTemplate}" ItemsSource="{TemplateBinding ResultTicks}" ItemTemplateSelector="{TemplateBinding TickTemplateSelector}" Maximum="{TemplateBinding Maximum}" Minimum="{TemplateBinding Minimum}" Style="{TemplateBinding TickBarStyle}"/>
<ContentControl x:Name="Track" Background="{TemplateBinding Background}" Grid.ColumnSpan="3" Grid.Column="1" Grid.Row="1" Style="{TemplateBinding TrackStyle}" VerticalAlignment="Center"/>
<RepeatButton x:Name="DecreaseButton" Delay="{TemplateBinding Delay}" Interval="{TemplateBinding RepeatInterval}" Grid.Row="1" Style="{TemplateBinding DecreaseHandleStyle}" Visibility="{TemplateBinding HandlesVisibility}"/>
<RepeatButton x:Name="LargeDecreaseButton" Grid.Column="1" Delay="{TemplateBinding Delay}" Interval="{TemplateBinding RepeatInterval}" Grid.Row="1">
<RepeatButton.Style>
<Style TargetType="RepeatButton">
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="RepeatButton">
<Grid Background="Transparent"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</RepeatButton.Style>
</RepeatButton>
<!-- Left Track-->
<Rectangle Grid.Row="1" Grid.Column="1" StrokeThickness="0" Margin="0,9,0,11" Fill="{TemplateBinding Background}" />
<!-- Right Track-->
<Rectangle Grid.Row="1" Grid.Column="3" StrokeThickness="0" Margin="0,9,0,11" Fill="{TemplateBinding Foreground}" />
<Grid Grid.Column="2" Grid.Row="1" Visibility="{TemplateBinding ThumbVisibility}">
<Thumb x:Name="SingleThumbHost" Style="{TemplateBinding ThumbStyle}"/>
<StackPanel x:Name="RangeThumbsPanel" Orientation="Horizontal" Visibility="Collapsed">
<!-- Left Thumb -->
<Grid Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Thumb x:Name="RangeStartThumb" Grid.Row="0" Grid.Column="0" Style="{TemplateBinding ThumbStyle}" Background="{TemplateBinding Background}">
<Thumb.Foreground>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFF0E663" Offset="0.13"/>
<GradientStop Color="#FFAB9C00" Offset="0.917"/>
<GradientStop Color="#FFE3D75D" Offset="0.065"/>
<GradientStop Color="#FFD8C600" Offset="0.6"/>
<GradientStop Color="#FFEADD4B" Offset="0.339"/>
<GradientStop Color="#FFD3C100" Offset="0.665"/>
</LinearGradientBrush>
</Thumb.Foreground>
</Thumb>
<TextBlock Grid.Row="1" Grid.Column="0" Foreground="#FF7A7A7A" FontFamily="Century Gothic" FontSize="8.5" Text="{Binding Path=SelectionStart, RelativeSource={RelativeSource TemplatedParent}, StringFormat='\{0:N0\}'}" TextAlignment="Center" />
</Grid>
<!-- Middle Bar -->
<Thumb x:Name="RangeMiddleThumb" Style="{TemplateBinding SelectionMiddleThumbStyle}" />
<!-- Right Thumb -->
<Grid Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Thumb x:Name="RangeEndThumb" Grid.Row="0" Grid.Column="0" Style="{TemplateBinding ThumbStyle}" Foreground="{TemplateBinding Foreground}">
<Thumb.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFF0E663" Offset="0.13"/>
<GradientStop Color="#FFAB9C00" Offset="0.917"/>
<GradientStop Color="#FFE3D75D" Offset="0.065"/>
<GradientStop Color="#FFD8C600" Offset="0.6"/>
<GradientStop Color="#FFEADD4B" Offset="0.339"/>
<GradientStop Color="#FFD3C100" Offset="0.665"/>
</LinearGradientBrush>
</Thumb.Background>
</Thumb>
<TextBlock Grid.Row="1" Grid.Column="0" Foreground="#FF7A7A7A" FontFamily="Century Gothic" FontSize="8.5" Text="{Binding Path=SelectionEnd, RelativeSource={RelativeSource TemplatedParent}, StringFormat='\{0:N0\}'}" TextAlignment="Center" />
</Grid>
</StackPanel>
</Grid>
<RepeatButton x:Name="LargeIncreaseButton" Grid.Column="3" Delay="{TemplateBinding Delay}" Interval="{TemplateBinding RepeatInterval}" Grid.Row="1">
<RepeatButton.Style>
<Style TargetType="RepeatButton">
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="RepeatButton">
<Grid Background="Transparent"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</RepeatButton.Style>
</RepeatButton>
<RepeatButton x:Name="IncreaseButton" Grid.Column="4" Delay="{TemplateBinding Delay}" Interval="{TemplateBinding RepeatInterval}" Grid.Row="1" RenderTransformOrigin="0.5,0.5" Style="{TemplateBinding IncreaseHandleStyle}" Visibility="{TemplateBinding HandlesVisibility}"/>
<telerik:RadTickBar x:Name="BottomTickBar" Grid.ColumnSpan="3" Grid.Column="1" ItemTemplate="{TemplateBinding TickTemplate}" ItemsSource="{TemplateBinding ResultTicks}" ItemTemplateSelector="{TemplateBinding TickTemplateSelector}" Maximum="{TemplateBinding Maximum}" Minimum="{TemplateBinding Minimum}" Grid.Row="2" Style="{TemplateBinding TickBarStyle}"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<StackPanel Grid.Row="0" Grid.Column="0" Background="White">
<Border Padding="10" >
<telerik:RadSlider x:Name="sld5" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="100" Maximum="300" SelectionStart="100" SelectionEnd="300" Style="{StaticResource RadSliderStyle1}" Width="239" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld6" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="100" SelectionStart="-25" SelectionEnd="100" Style="{StaticResource RadSliderStyle1}" Width="239" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld7" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="101" SelectionStart="-25" SelectionEnd="101" Style="{StaticResource RadSliderStyle1}" Width="239" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld8" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="100" Maximum="300" SelectionStart="100" SelectionEnd="300" Style="{StaticResource RadSliderStyle1}" Width="240" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld9" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="100" SelectionStart="-25" SelectionEnd="100" Style="{StaticResource RadSliderStyle1}" Width="240" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld10" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="101" SelectionStart="-25" SelectionEnd="101" Style="{StaticResource RadSliderStyle1}" Width="240" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld11" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="100" Maximum="300" SelectionStart="100" SelectionEnd="300" Style="{StaticResource RadSliderStyle1}" Width="241" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld12" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="100" SelectionStart="-25" SelectionEnd="100" Style="{StaticResource RadSliderStyle1}" Width="241" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld13" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="101" SelectionStart="-25" SelectionEnd="101" Style="{StaticResource RadSliderStyle1}" Width="241" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld14" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="100" Maximum="300" SelectionStart="100" SelectionEnd="300" Style="{StaticResource RadSliderStyle1}" Width="242" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld15" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="100" SelectionStart="-25" SelectionEnd="100" Style="{StaticResource RadSliderStyle1}" Width="242" />
</Border>
<Border Padding="10" >
<telerik:RadSlider x:Name="sld16" IsSelectionRangeEnabled="True" Orientation="Horizontal" Minimum="-100" Maximum="101" SelectionStart="-25" SelectionEnd="101" Style="{StaticResource RadSliderStyle1}" Width="242" />
</Border>
</StackPanel>
</Grid>
</UserControl>