final TreePath path = evt.getPath();
try {
final MusicTreeNode node = (MusicTreeNode) path.getLastPathComponent();
final MusicItem item = (MusicItem) node.getUserObject();
if ( item.getType().equals(MusicItem.ARTIST) ) {
fillArtistNode( node, item );
}
else if ( item.getType().equals(MusicItem.ALBUM) ) {
fillAlbumNode( node, item );
}
}