Mandatory dropdown in red colour

Hi all, I need to put a dropdown in a red marked colour if the user don't select anything on it.
I have try these method:
a)   wd_this->message_manager->report_attribute_error_message(
      message_text = text
      element = wd_context_element
      attribute_name = attribute ).
b)     lo_view_controller = wd_this->wd_get_api( ).
    cl_wd_dynamic_tool=>check_mandatory_attr_on_view(
    EXPORTING
    view_controller = lo_view_controller
    IMPORTING
    messages = msg_tab ).
But the dropdown in red is never been marked.
Am I forgetting something please?
Help please.

Just thought to update that I am using a DropDownByIndex for this coding:
Suppose I have a context node by name NODE_IDX & have 2 attributes under this KEY & VALUE. I have associated a supply function POPULATE_NODE with my context node to fill it with values as how shown below:
METHOD populate_node .
* data declaration
DATA lt_node_idx TYPE wd_this->elements_node_idx.
DATA ls_node_idx LIKE LINE OF lt_node_idx.
DATA lv_str TYPE string.
*** If I ommit writing 3 lines below then the system will by default have the 1st value of my
*** dropdown as selected & so would assume that the user has already selected 1 value
*** Try running the component with and without these 3 lines & check the difference
ls_node_idx-key = ''.
ls_node_idx-value = ''.
APPEND ls_node_idx TO lt_node_idx.
DO 10 TIMES.
    lv_str = sy-index.
    CONCATENATE 'TEXT'
                lv_str INTO lv_str SEPARATED BY space.
    ls_node_idx-key = sy-index.
    ls_node_idx-value = lv_str.
    APPEND ls_node_idx TO lt_node_idx.
    CLEAR ls_node_idx.
ENDDO.
* bind all the elements
node->bind_table( new_items            = lt_node_idx
                    set_initial_elements = abap_true ).
ENDMETHOD.
I have bound the "texts" property of my DropDown to the attribute "Value" & I have changed the "state" property to "Required".
I also put the below coding within my WDDOAFTERACTION method to trigger error messages for any mandatory fields which the user hasn't filled out.
METHOD wddoafteraction .
DATA: lt_msg TYPE cl_wd_dynamic_tool=>t_check_result_message_tab,
        lo_view_controller TYPE REF TO if_wd_view_controller.
DATA lo_message_manager    TYPE REF TO if_wd_message_manager.
lo_view_controller ?= wd_this->wd_get_api( ).
lo_message_manager = lo_view_controller->get_message_manager( ).
lo_view_controller = wd_this->wd_get_api( ).
cl_wd_dynamic_tool=>check_mandatory_attr_on_view(
    EXPORTING
      view_controller = lo_view_controller
      display_messages = abap_true
    IMPORTING
      messages = lt_msg ).
ENDMETHOD.
Regards,
Uday
Edited by: Uday Gubbala on Jun 9, 2009 11:39 AM

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