title: kendo ui multiselect get the names of the values already selected
body: <p>i have a multiselect kendo, populated by a controller in mvc.</p>
  
  <p>i have a option in the dropdown that is selectAll, and when i select that option, i clear all the other's, now i want to disable the dropdown (but not the option to delete the "Select All" option. </p>
  
  <p>if i do</p>
  
  <pre><code>multiselect.enable(false) //i lose the option to delete the selected "Select All"
  </code></pre>
  
  <p>With this code bellow: when i choose the option "Select All" i clear all the other option selected and kendo just let the Selected All option selected. </p>
  
  <pre><code> if (sel == 'Select All') {
  
          var name_Controller = $(e.item).parent().attr('id');
  
          var name_Controller = name_Controller.substr(0, name_Controller.indexOf('_'));
  
          var t = "#" + name_Controller;
  
          var required = $(t).data("kendoMultiSelect");
  
          required.value(""); // to clean 
  </code></pre>
  
  <p>Now.. how can i disable the other option, or know the name of the option already choosed in order to do something like this:</p>
  
  <pre><code>       if(required.contains("Select All")) //dont do nothing
  </code></pre>
  
  <p>the required.val() doenst work because this is used in multiple dropdowns all automaticaly with diferent id's</p>