Code

void OnDrawAdjustmentHandles(object sender, MindFusion.Diagramming.DrawItemEventArgs e)
{
	var node = (DiagramNode)e.Item;
	var style = node == diagram.ActiveItem ?
		diagram.ActiveItemHandlesStyle :
		diagram.SelectedItemHandlesStyle;

	InternalUtils.DrawSelHandles(
		e.Graphics,
		style,
		diagram.DisabledHandlesStyle,
		node.Bounds,
		node.RotationAngle,
		node.EnabledHandles,
		true,
		HandlesStyle.DashFrame,
		diagram.AdjustmentHandlesSize);
}

void OnHitTestAdjustmentHandles(object sender, HitTestEventArgs e)
{
	var node = (DiagramNode)e.Item;
	node.HandlesStyle = HandlesStyle.DashFrame;

	int handle = -1;
	node.HitTestHandle(e.MousePosition, ref handle);
	if (handle == -1 && node.ContainsPoint(e.MousePosition))
		handle = 8;
	e.HitResult = handle;
	node.HandlesStyle = HandlesStyle.Custom;
}