i would like to open the "NewTopic" Form via Ajax, whe click on a button.

If created a controller with a Router and a component FORUM_CMP_ForumAddTopic

It all works fine and I am getting content with the following test data in the component:

$this->assign('content', 'test'); with a component view

But how can I render the template form "FORUM_CLASS_TopicAddForm" ?

I´ve tried several things, but I don´t know how to render this.

It shows me "There is no form with name `add-topic-form` !"