By default, the Index property is automatically updated by the control, as soon as the user adds / removes layers to the control. 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 Key property retrieves or sets the layer's key. 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 ).