Making htmlb:listbox bindable by new BSP-Element

Hi,
I tried to built a new bsp element which renders a listbox and where the table attribute is bindable.
So far I declared the element listBoxBindable in my own BSP-Extension with the same atrributes as htmlb:listBox.
For Element content I marked 'empty'.
For More Options I marked 'User defined Validation' and 'No return of PAGE DONE...'.
In element-handler-class I copied the methods IF_BSP_ELEMENT~COMPILE_TIME_IS_VALID
IF_BSP_ELEMENT~RUNTIME_IS_VALID
from HTMLB:ListBox.
method if_bsp_element~do_at_beginning.
resolve_model_binding( ).
data: listbox type ref to cl_htmlb_listbox.
listbox ?= cl_htmlb_listbox=>factory(
            id                          = me->id
            backgroundcolor             = me->backgroundcolor
            disabled                    = me->disabled
            encode                      = me->encode
            multiple                    = me->multiple
            nameofbackgroundcolorcolumn = me->nameofbackgroundcolorcolumn
            nameofkeycolumn             = me->nameofkeycolumn
            nameoftextcolorcolumn       = me->nameoftextcolorcolumn
            nameofvaluecolumn           = me->nameofvaluecolumn
            selection                   = me->selection
            selections                  = me->selections
            size                        = me->size
            table                       = me->table
            textcolor                   = me->textcolor
            width                       = me->width ).
rc = co_element_done.
endmethod.
method resolve_model_binding.
data: model_name type string.
* table
if _table is not initial.
    call method cl_bsp_model=>if_bsp_model_util~split_binding_expression
      exporting
        binding_expression = _table
      importing
        attribute_path     = m_table_path
        model_name         = model_name.
    m_table_model = m_page_context->get_model( model_name ).
    table = m_table_model->get_attribute_data_ref( attribute_path = m_table_path ).
endif.
endmethod.
<b>Unfortunately nothing is rendered - anybody an idea where I forgot something?</b>
Thx in advance!

Just off the top of my head, I would say you are missing the rendering loop for the listbox.
Add the following after the method call to cl_htmlb_listbox=>factory.
while m_page_context->element_process( element = listbox ) = co_element_continue.
endwhile. "End Listbox Render

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