By default, the Key property is empty. The Key property retrieves or sets the layer's key. The Index property is read-only and zero-based, which indicates that the layer with the Index property 0, it is the first layer, while the layer with the index Count - 1, is the last layer in the control ( in z-order ). The Item property of the Layers collection accesses a Layer giving its index or key. The LayerFromPoint retrieves the index of the layer from the point ( only visible and selectable objects are included ).