Sets the value of the SummaryBarStrokeThickness attached property to a specified element such as a task item, overriding the default value provided by the GanttChartView control. The SummaryBarStrokeThickness property value indicates the thickness of a summary task bar's outline in the GanttChartView control. Overriding the default value for a specific item requires that the IsItemAppearanceApplied property of the control to be set to true.

public static void SetSummaryBarStrokeThickness(
	DependencyObject element,
	double summaryBarStrokeThickness
)

Public Shared Sub SetSummaryBarStrokeThickness ( _
	element As DependencyObject, _
	summaryBarStrokeThickness As Double _
)