How can I set the color of a connector line in PPT?

Greeting,

I have draw a line/connector within a rectangle-shape from the lower left corner to the upper rigth corner:

Element = Slide1.Shapes.AddShape(Microsoft.Office.Core.MsoAutoShapeType.msoShapeRectangle, X, Y, w, h)

Element.Nodes.SetEditingType(1, Microsoft.Office.Core.MsoEditingType.msoEditingCorner)
Element.Nodes.SetEditingType(2, Microsoft.Office.Core.MsoEditingType.msoEditingCorner)
Element.Nodes.SetEditingType(3, Microsoft.Office.Core.MsoEditingType.msoEditingCorner)
Element.Nodes.SetEditingType(4, Microsoft.Office.Core.MsoEditingType.msoEditingCorner)

With Slide1.Shapes.AddConnector(Microsoft.Office.Core.MsoConnectorType.msoConnectorStraight, Element.Left, Element.Top + Element.Height, Element.Left + Element.Width, Element.Top).ConnectorFormat
.BeginConnect(ConnectedShape:=Element, ConnectionSite:=4)
.EndConnect(ConnectedShape:=Element, ConnectionSite:=2)
End With

The line is getting automatic the color blue.

Now I want to set the color to black, but I can't find a method for this.

Regards

  Michael