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How to: Customize the Thumb Size on a ScrollBar

Learn how to customize the Thumb Size on a ScrollBar.

03/30/2017

devdivchpfy22

ScrollBar control [WPF]

customizing thumb size [WPF]

thumb size [WPF]

fa32b866-5ca1-4e73-85e7-2ac64b80d194

How to: Customize the Thumb Size on a ScrollBar

This topic explains how to set the xref:System.Windows.Controls.Primitives.Thumb of a xref:System.Windows.Controls.Primitives.ScrollBar to a fixed size and how to specify a minimum size for the xref:System.Windows.Controls.Primitives.Thumb of a xref:System.Windows.Controls.Primitives.ScrollBar.

Create a ScrollBar with a fixed Thumb size

The following example creates a xref:System.Windows.Controls.Primitives.ScrollBar that has a xref:System.Windows.Controls.Primitives.Thumb with a fixed size. The example sets the xref:System.Windows.Controls.Primitives.Track.ViewportSize%2A property of the xref:System.Windows.Controls.Primitives.Thumb to xref:System.Double.NaN and sets the height of the xref:System.Windows.Controls.Primitives.Thumb. To create a horizontal xref:System.Windows.Controls.Primitives.ScrollBar with a xref:System.Windows.Controls.Primitives.Thumb that has a fixed width, set the width of the xref:System.Windows.Controls.Primitives.Thumb.

[!code-xamlScrollBarCustomThumbSize#1]

Create a ScrollBar with a minimum Thumb size

The following example creates a xref:System.Windows.Controls.Primitives.ScrollBar that has a xref:System.Windows.Controls.Primitives.Thumb with a minimum size. The example sets the value of xref:System.Windows.SystemParameters.VerticalScrollBarButtonHeightKey%2A. To create a horizontal xref:System.Windows.Controls.Primitives.ScrollBar with a xref:System.Windows.Controls.Primitives.Thumb that has a minimum width, set the xref:System.Windows.SystemParameters.HorizontalScrollBarButtonWidthKey%2A.

[!code-xamlScrollBarCustomThumbSize#2]

See also

ScrollBar Styles and Templates