By default, the Enabled property is True. The Enabled property specifies whether the entire control is enabled or disabled. The Selectable property returns or sets a value that indicates whether the layer is selectable. You can use the Grayscale property to show the entire layer in gray scale ( disable state). For instance, you can simulate a disabled layer by changing the layer's Grayscale property on True, and setting the layer's Selectable property on False.