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<blockquote data-quote="morpheus_xx" data-source="post: 1113694" data-attributes="member: 48495">This could be a compromise: the knob is positioned &quot;TopOffset + KnobHeight / 2&quot;. For longer list it looks better than for short lists.[CODE=XML]&nbsp;&nbsp; &lt;!-- Knob --&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;StackPanel Grid.Row=&quot;0&quot; Grid.Column=&quot;0&quot; Orientation=&quot;Vertical&quot;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;StackPanel&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;StackPanel.Height&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;MultiBinding Converter=&quot;{StaticResource ExpressionMultiValueConverter}&quot; ConverterParameter=&quot;{}{0}+({1}/2)&quot;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;TemplateBinding Path=&quot;ScrollBarYKnobPos&quot; /&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;TemplateBinding Path=&quot;ScrollBarYKnobHeight&quot; /&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/MultiBinding&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/StackPanel.Height&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/StackPanel&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;Rectangle x:Name=&quot;ScrollBarYKnob&quot; Width=&quot;{ThemeResource ScrollBarKnobWidth}&quot; Height=&quot;18&quot;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Stroke=&quot;{ThemeResource ScrollBarKnobStrokeColor}&quot; RadiusX=&quot;9&quot; RadiusY=&quot;9&quot;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Fill=&quot;{ThemeResource ScrollBarKnobBackgroundColor}&quot;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/Rectangle&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/StackPanel&gt;[/CODE][ATTACH]158543[/ATTACH] [ATTACH]158544[/ATTACH] [ATTACH]158545[/ATTACH] [ATTACH]158546[/ATTACH]</blockquote>

[QUOTE="morpheus_xx, post: 1113694, member: 48495"] This could be a compromise: the knob is positioned "TopOffset + KnobHeight / 2". For longer list it looks better than for short lists. [CODE=XML]  <StackPanel Grid.Row="0" Grid.Column="0" Orientation="Vertical"> <StackPanel> <StackPanel.Height> <MultiBinding Converter="{StaticResource ExpressionMultiValueConverter}" ConverterParameter="{}{0}+({1}/2)"> <TemplateBinding Path="ScrollBarYKnobPos" /> <TemplateBinding Path="ScrollBarYKnobHeight" /> </MultiBinding> </StackPanel.Height> </StackPanel> <Rectangle x:Name="ScrollBarYKnob" Width="{ThemeResource ScrollBarKnobWidth}" Height="18" Stroke="{ThemeResource ScrollBarKnobStrokeColor}" RadiusX="9" RadiusY="9" Fill="{ThemeResource ScrollBarKnobBackgroundColor}"> </Rectangle> </StackPanel>[/CODE] [ATTACH]158543[/ATTACH] [ATTACH]158544[/ATTACH] [ATTACH]158545[/ATTACH] [ATTACH]158546[/ATTACH] [/QUOTE]

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