Interaction History. Pass Business Activity ID into ZComponent

Question

Hello,
I have a requirement to pass Activity ID into custom ZView. The main component for interaction history is ICCMP_BT_ACT. I've done binding to custom controller before but this one doesn't have it.
I've adden new button to the screen to invoke ZView. So the question is how do I pass the selected activity Id now?

Answer 1

Here is what I've done so far:
1. In the main component ICCMP_BT_ACT I've redefined method WD_USAGE_INITIALIZE of component controller class and added following lines:
  CASE IV_USAGE->USAGE_NAME.
    WHEN 'ZComponent'.                                  "#EC NOTEXT
      TRY.
          CALL METHOD IV_USAGE->BIND_CONTEXT_NODE
            EXPORTING
              IV_CONTROLLER_TYPE  = CL_BSP_WD_CONTROLLER=>CO_TYPE_COMPONENT
              IV_NAME             = 'ICCMP_BT_ACT/BSPWDComponent'
              IV_TARGET_NODE_NAME = 'BTAdminH'
              IV_NODE_2_BIND      = 'BTAdminH'.
        CATCH CX_ROOT.
      ENDTRY.
ENDCASE.
2. In my ZComponent I've added context node BTAdminH, attribute GUID
3. When reading data from context node LR_CURRENT is not bond  
LR_CURRENT ?= TYPED_CONTEXT->BTADMINH->COLLECTION_WRAPPER->GET_CURRENT( ).
   IF LR_CURRENT IS BOUND.
     LV_GUID_STRING   = LR_CURRENT->GET_PROPERTY_AS_STRING( IV_ATTR_NAME  'GUID' ).   
  ENDIF.
Am I missing some steps???