//Display Selected content to the user using external User Control
private void lb_mainHeading_Click(object sender, EventArgs e)
{
Logic.Controller controller = Logic.Controller.getController();
controller.setGridViewContent(Logic.Library.getGroupTracks(group, title));
}
//display all tracks on gridview
private void btn_allSongs_Click(object sender, EventArgs e)
{
Logic.Controller controller = Controller.getController();
controller.setGridViewContent(Library.Tracks);
}