How to create new attribute instance in CMS Component Editor in Smartedit?

How to create new attribute instance in CMS Component Editor in Smartedit, if this attribute is also CMS Component?

The structure of item:

<itemtype code="componentContainer" extends="SimpleCMSComponent"
          jaloclass="...">
    <attributes>
        <attribute qualifier="banner" type="SomeComponent">
            <persistence type="property"/>
            <modifiers read="true" search="true" write="true" optional="false"/>
        </attribute>

SomeComponent is also extends SimpleCMSComponent

Only dropdown selector and editing are present. so I can link and edit already existing component. But I can't create the new one in the editor. Is it possible to fix it somehow?