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Create Custom Dropdown Box in Tinymce in Wordpress for Shortcodes
/**
 * This class is used to create drop menus, a drop menu can be a
 * context menu, or a menu for a list box or a menu bar.
 *
 * @class tinymce.ui.DropMenu
 * @extends tinymce.ui.Menu
 * @example
 * // Adds a menu to the currently active editor instance
 * var dm = tinyMCE.activeEditor.controlManager.createDropMenu('somemenu');
 *
 * // Add some menu items
 * dm.add({title : 'Menu 1', onclick : function() {
 *     alert('Item 1 was clicked.');
 * }});
 *
 * dm.add({title : 'Menu 2', onclick : function() {
 *     alert('Item 2 was clicked.');
 * }});
 *
 * // Adds a submenu
 * var sub1 = dm.addMenu({title : 'Menu 3'});
 * sub1.add({title : 'Menu 1.1', onclick : function() {
 *     alert('Item 1.1 was clicked.');
 * }});
 */