title: How can I superpose an md-dialog on md-dialog
body: <p>I tried to open a md-dialog from an opened one ,but the problem is that the first md-dialog closed when the second opened </p>
  
  <pre><code>// the controller of the first popUp 
  class popUpOneController{
        constructor($mdDialog){
        this.$mdDialog=$mdDialog;
         .
         .
         .
         } 
    others methods codes......
  // the second $mdDialog to be opened from the  first 
  // this function will be executed by clicking  on a html  button
    openPopUp2(){
        // here we call a component into the $mdDialog
        this.$mdDialog.show({
              template: '&lt;interlo-sibel  data-to-pass='+data+'  index-selectedElm='+index+' type='+type+' &gt;&lt;/interlo-sibel&gt;',
              targetEvent: event,
              escapeToClose: false
  
          })
     } 
     popUpOneController.$inject=['$mdDialog'];
  
  
   export default popUpOneController
  </code></pre>