By default, the Selectable property is True, so the picture is selectable on the layer's background. The Selectable property specifies whether the picture on the layer's background is selectable.  Use the Name / Value property to specify a picture to be displayed on the layer's background. For instance, you can use Selectable property on False, to prevent selecting the picture on the layer's background. The Selectable property of the Background object, affects all the pictures / colors being shown on the layer's background. You can use the Grayscale property to show the entire layer in gray scale ( disable state).