Avia Page Builder – 2 Step Modal Groups

Hey, my problem is that i want to make an Avia-Widget which has two modal_groups.
I want to create a modal_group inside a modal_group, like this:

function popup_elements()
{
    $this->elements = array(
        array(
            "name" => __("edit/create", 'avia_framework' ),
            "desc" => '',
            "type" 			=> "modal_group",
            "id" 			=> "outter_content",
            "modal_title" 	=> __("Edit title", 'avia_framework' ),
            "std"			=> array(
                array('title'=>__('Titel', 'avia_framework' ), 'icon'=>'43', 'content'=>'Enter content here'),
            ),
            'subelements' 	=> array(
                array(
                    "name" => __("Title-1", 'avia_framework'),
                    "desc" => __("Add an title here", 'avia_framework'),
                    "id" => "title",
                    "type" => "input",
                    "std" => __("Title1", 'avia_framework')),
                array(
                    "name" => __("edit/create", 'avia_framework' ),
                    "desc" => '',
                    "type" 			=> "modal_group",
                    "id" 			=> "inner_content",
                    "modal_title" 	=> __("Content", 'avia_framework' ),
                    "std"			=> array(
                        array('title'=>__('Content', 'avia_framework' ), 'icon'=>'43', 'content'=>'Enter content here'),
                    ),
                    'subelements' 	=> array(
                        array(
                            "name" => __("Content 1", 'avia_framework'),
                            "desc" => __("Add content", 'avia_framework'),
                            "id" => "content",
                            "type" => "input",
                            "std" => __("Content", 'avia_framework')),

                    )
                ),
            )
        ),

    );
}

My Problem is. that the first modal_group overwrites the content of the second modal_group, so I can open infinit tabs on this widget..
Is there any solution?