<Window x:Class="ScrollBarCustomThumbSize.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Title="" >
<Window.Resources>
<Style TargetType="{x:Type Slider}">
<Setter Property = "Background" Value = "Red"/>
<Setter Property = "IsSnapToTickEnabled" Value ="True"/>
<Setter Property = "TickPlacement" Value ="BottomRight"/>
<Setter Property = "AutoToolTipPlacement" Value ="BottomRight"/>
<Setter Property = "TickFrequency" Value ="1"/>
</Style>
</Window.Resources>
<Grid>
<Slider></Slider>
</Grid>
</Window>
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