Create object by filter

Hi Folks ,
i got a litle problem with creation of objects.
here's the story about .
iv'e created an interface intf1 with filter and also several different classes that each one of them is implement the interface intf1 .
let's say C1 ...Cn those are the classes .
now i want to create one of them dynamically and therefore i use static function :
CALL METHOD cl_exit_master=>create_obj_by_interface_filter
    EXPORTING
      inter_name   = 'INTF1'
      method_name  = 'LIKE_CONTRUCTOR'
      flt_val      = filter_value
    IMPORTING
      exit_obj_tab = lt_exit_obj.
inside lt_exit_obj i got back from the function the name of interface and some data but the field "obj" which suppose to be the referance for newly created object is NULL .
does someone have any tips hints or tricks how can this issue can be solved ?
Thx ya all .

HI
GOOD
GO THROUGH THIS LINKS
http://help.sap.com/saphelp_nw04/helpdata/en/8c/ed4f3e065de946e10000000a114084/content.htm
http://www.intellicorp.com/support/NetProcess/TechNotes/lcom-filter-documentation-006.pdf
THANKS
MRUTYUN

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    7) http://esnips.com/doc/39fdc647-1aed-4b40-a476-4d3042b6ec28/class_builder.ppt
    8) http://www.amazon.com/gp/explorer/0201750805/2/ref=pd_lpo_ase/102-9378020-8749710?ie=UTF8
    1) http://www.erpgenie.com/sap/abap/OO/index.htm
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    Laurens Steffers
    The Netherlands.

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    Regards

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