(in PresentationFramework.dll)XMLNS for XAML:
Public Property StrokeStartLineCap As PenLineCap
<object StrokeStartLineCap="PenLineCap" .../>
This property has no effect if you set it on a shape that has no Stroke or that has no start or end points. For example, this property has no effect if you set it on an Ellipse.
Supported in: 4.6, 4.5, 4, 3.5, 3.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1