// Use this for initialization
void Start()
{
layerChooser = new ComboBox();
layerChooser.SetAllowMultiple(true);
//There's no built in way to get layers, so LayerUtils was created to get the currently set layers.
Dictionary <string, int> layers = LayerUtils.GetLayers();
foreach (string layerName in layers.Keys)
{
layerChooser.AddItem(layerName, layers[layerName], OnLayerSelected, OnLayerUnselected);
}
}