By default, the Selectable property is True, which indicates that the layer is selectable. The Selectable property returns or sets a value that indicates whether the layer is selectable. Use the DefaultLayer(exDefLayerSelectable) property to specify the default value for the Selectable property,  before adding any layer.  The Visible property shows or hides a specific layer (visible).  The LayerFromPoint property retrieves the layer from point that's visible and selectable. The OnDrag property indicates the action to be performed when the user drags the layer ( dragable ).  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.