How to make an internal frame a modal frame?

aoa Friends i am trying to make a application using jframe with jdesktoppane and jinternal frame.is there any body who can guide me through that :
how to make a jinternal frame a modal frame so that if a new jinternalform is opened than the previous one could not be accessed and if new one is closed then we can use that form.

http://developer.java.sun.com/developer/JDCTechTips/2001/tt1220.html
This is the example I used approach 2 to simulate a model frame.
rykk

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      go_grid            TYPE REF TO cl_gui_alv_grid,
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      gv_language        TYPE spras VALUE 'E',
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*       MODULE PBO OUTPUT                                             *
MODULE pbo OUTPUT.
SET PF-STATUS 'BASIC'.
SET TITLEBAR '001'.
PERFORM create_and_init_alv CHANGING gt_outtab[]
                                       gt_fieldcat.
ENDMODULE.                    "pbo OUTPUT
*       MODULE PAI INPUT                                              *
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ENDFORM.                               "CREATE_AND_INIT_ALV
FORM build_display_table.
FREE gt_outtab.
DO 10 TIMES.
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ENDDO.
ENDFORM.                               "build_display_table
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ENDFORM.                               "build_fieldcat
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How to make an internal frame a modal frame?

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