tinymce_select.php

(function() {
    tinymce.PluginManager.add('tx_tinymce_button', function( editor, url ) {
        editor.addButton( 'tx_tinymce_button', {
            title: 'My test button',
            icon: 'icon dashicons-wordpress-alt',
            onclick: function() {
				editor.windowManager.open( {
					title: 'Insert Your Shortcode',
					body: [
										
						{
							type: 'listbox',
							name: 'listboxName',
							label: 'List Box',
							'values': [
							{text: 'Option 1', value: '1'},
							{text: 'Option 2', value: '2'},
							{text: 'Option 3', value: '3'}
						]
					     }
					],
				onsubmit: function( e ) {
					editor.insertContent( '[random_shortcode listbox="' + e.data.listboxName + '"]');
				}
			});
		}
        });
    });
})();