protected override void OnRender(DrawingContext dc)
{
var pen = Caches.GetDashedPen(
new ByteColor(0xFF, 0x41, 0x69, 0xE1),
this.RoundLayoutValue(2));
dc.DrawLine(
pen,
new Point(0, 0),
_isVertical
? new Point(ActualWidth, 0)
: new Point(0, ActualHeight));
}