UI Element GRoup -> select line and get line information

Hi guys,

I want to create a webdynpro application. Actually I have a problem with the UI Element GRoup and I have no Idea where the problem is.

Here is the screen with two group element

The problem is that the user have to select a line in the first table. But it isn't possible. But in the second table it is possible .

I create the first table with the following code:

  cl_wd_matrix_layout=>new_matrix_layout( container = lr_container ).

  CALL METHOD WD_NODE_INFO->ADD_NEW_CHILD_NODE
EXPORTING
NAME                         = STRUCTURE_NAME
IS_MULTIPLE                  = ABAP_true
IS_INITIALIZE_LEAD_SELECTION = ABAP_false
*          is_mandatory = abap_true
*          is_mandatory_selection = abap_true
RECEIVING
CHILD_NODE_INFO              = wd_node_info.

    CALL METHOD CL_WD_table=>new_table
EXPORTING
bind_data_source = STRUCTURE_NAME
*        BIND_ROW_SELECTABLE = abap_true
ID               = 'TABLE'
RECEIVING
control          = lr_table.

The  second table I create the table wit the "same" code

CALL METHOD WD_NODE_INFO->ADD_NEW_CHILD_NODE
EXPORTING
NAME                         = STRUCTURE_NAME
IS_MULTIPLE                  = ABAP_TRUE
IS_INITIALIZE_LEAD_SELECTION = ABAP_FALSE
RECEIVING
CHILD_NODE_INFO              = wd_node_info.

cl_wd_matrix_layout=>new_matrix_layout( container = lr_container ).

" Creating internal table with the same structure as our dynamic context node
CALL METHOD CL_WD_table=>new_table
EXPORTING
bind_data_source = STRUCTURE_NAME
ID               = 'RDLTABLE'
RECEIVING
control          = lr_table.

------->>>>>>> I think here is no different

The Only different I think are the layout settings

1. I want to select one line in the first table(TABLE_GROUP). How can I mark only one line in this table ?

2. If the user mark one line I want to read/get the information of this line. I don't know how ?

Thanks for your assistance.

Wolfgang