H5PEditor - Drag and Drop Element creation

Hi there,

I try to create a Drag'n'Drop question with an advancedText-Element as draggable. In the advancedText-Element theres MathJax-Markup that has to be processed by MathJax instantly AFTER creation.

For that I am looking for a event/hook or even Line in the code that is ran when adding a new Draggable in the H5PEditor. Despite intensive search in the code-base I couldn't find any Line thats does the job I am looking for. But I found a Virtual File in Chrome (VMxxxx) that seems to be dynamically created with these line of code in it (excerpt):

H5P.AdvancedText = (function ($) {

  /**
   * A simple library for displaying text with advanced styling.
   *
   * @class H5P.AdvancedText
   * @param {Object} parameters
   * @param {Object} [parameters.text='New text']
   * @param {number} id
   */
  function AdvancedText(parameters, id) {
    var self = this;

    var html = (parameters.text === undefined ? '<em>New text</em>' : parameters.text);

    /**
     * Wipe container and add text html.
     *
     * @alias H5P.AdvancedText#attach
     * @param {H5P.jQuery} $container
     */
    self.attach = function ($container) {
      $container.addClass('h5p-advanced-text').html(html);
    };
  }

  return AdvancedText;

})(H5P.jQuery);

Can someone help me with ths Problem?