title: Add popup in action of ModelAdmin
body: <p>I have define a custom action in my model.Admin.</p>
  
  <pre><code>class ProjectAdmin(admin.ModelAdmin):
      list_display = ['ID','Name']
      actions = ['show_report']
      def show_report(self,request,queryset):
            # Popup a form
            # User input message
            # finish, go back to changlist form and finish the action.
      show_report.short_description = "Show report for selected Project"
  </code></pre>
  
  <p>Then when i select one item in Project changelist form, there is a item "Show report", when user select and click the "Go" button, i want to popup a form which allows user to input some comment. For example, after user click this action, i want to popup a dialog to let user input some message and then click OK in the popup, then finish the action. Is there any way to implement this, Thanks.</p>
  
  <p><strong>Update</strong> Maybe there is a easy way to do this, in the admin there is a delete confirm page. So if i can integrate my action with that page can custom that page. I think i must be better. Who know how to do this?</p>