void AddLayerItem(TileMapTreeViewItem parent, Layer layer)
{
TileMapTreeViewItem item = new TileMapTreeViewItem {
id = layer.id, displayName = layer.name, layer = layer
};
parent.AddChild(item);
if (layer is GroupLayer)
{
GroupLayer group = layer as GroupLayer;
for (int i = group.layers.Count - 1; i >= 0; i--)
{
AddLayerItem(item, group.layers[i] as Layer);
}
}
}
