Modify the shortcodes list in a text block

Hi Andy just found the solution. For information to any other user, here the php code to create an ad hoc shortcodes that adds an <abbr> tag to show full text on mouse hover on acronyms

<?php
/*it creates an <abbr> tag*/

if ( !class_exists( 'av_abbr' ) )
{
	class av_abbr extends aviaShortcodeTemplate
	{
			/**
			 * Create the config array for the shortcode button
			 */
			function shortcode_insert_button()
			{
				$this->config['name']			= __('Acronym Extension');
				$this->config['order']			= 100;
				$this->config['shortcode'] 		= 'av_abbr';
				$this->config['tooltip'] 	    = __('Creates a full text which appears on mouse over acronyms terms');
				$this->config['inline'] 	= true;
				$this->config['tinyMCE']    = array('tiny_always'=>true);
			}

			/**
			 * Popup Elements
			 *
			 * If this function is defined in a child class the element automatically gets an edit button, that, when pressed
			 * opens a modal window that allows to edit the element properties
			 *
			 * @return void
			 */
			function popup_elements()
			{
				$this->elements = array(
					
					array(
							"type" 	=> "tab_container", 'nodescription' => true
						),
						
					array(
							"type" 	=> "tab",
							"name"  => __("Content" , 'avia_framework'),
							'nodescription' => true
						),
					array(	"name" 	=> __("Acronym", 'avia_framework' ),
							"desc" 	=> __("This is the acronym.", 'avia_framework' ),
				            "id" 	=> "acronym",
				            "type" 	=> "input",
				            "std" => __("ACR", 'avia_framework' )),
					
					array(	"name" 	=> __("Full title", 'avia_framework' ),
							"desc" 	=> __("This is the text that appears on your acronym.", 'avia_framework' ),
				            "id" 	=> "title",
				            "type" 	=> "input",
				            "std" => __("Full text", 'avia_framework' )),
					array(
							"type" 	=> "close_div",
							'nodescription' => true
						),
						
				);

		}

			/**
			 * Frontend Shortcode Handler
			 *
			 * @param array $atts array of attributes
			 * @param string $content text within enclosing form of shortcode element
			 * @param string $shortcodename the shortcode found, when == callback name
			 * @return string $output returns the modified html string
			 */
			function shortcode_handler($atts, $content = "", $shortcodename = "", $meta = "")
			{
				$output = "";

				$atts = shortcode_atts(
						array(	'title'=>'',
								'acronym' =>'', 
							), $atts, $this->config['shortcode']);
				

			
				$output = '';
				
				$output= "<abbr title='".$atts['title']. "'> " . $atts['acronym'] . "</abbr>";

				
				return $output;
			}

	}
}

You can close the topic. Thanks

Elena