Dynamic Order by with user defined Where clause...

Hello!
I have a block based on a table, with no order by set and no where clause.
The block is queryable so users can filter the data to be retrieved.
Each of the columns on the form have a button above which requeries the block, applying the order by (SET_BLOCK_PROPERTY ( 'B12', ORDER_BY, :bc1.h_b12_custom_orderby ); )
The problem is that each time the block is requeried the user definied filter criteria is lost. Is there any way I can get a handle on this and maintain the filtering?
GET_BLOCK_PROPERTY(item, DEFAULT_WHERE); only retrieves the query entered while in design mode so this won't work.
I'm using Oracle Forms 6i, web based. Any suggestions are very much appreciated.
Thanks in advance,
Jay

Many thanks for your response Hedy,
Below is the procedure I used to achieve this.
I found GET_BLOCK_PROPERTY ( p_block, LAST_QUERY ) worked better than :SYSTEM.last_query. As the first time it is called within a block :SYSTEM.last_query returned the query made in another block - which I'm sure has it's applications.
Thanks again,
Jay
PROCEDURE set_last_query_where ( p_block IN VARCHAR2
, p_where IN VARCHAR2 DEFAULT NULL )IS
l_last_query VARCHAR2(10000);
l_last_where VARCHAR2(10000);
BEGIN
IF p_where IS NULL THEN
l_last_query := UPPER(GET_BLOCK_PROPERTY ( p_block, LAST_QUERY ));
l_last_where := SUBSTR ( UPPER ( l_last_query),
INSTR ( l_last_query, 'WHERE')+6, INSTR(SUBSTR(UPPER(l_last_query), INSTR(l_last_query, 'WHERE')+8), 'ORDER BY'));
ELSE
l_last_where := p_where;
END IF;
SET_BLOCK_PROPERTY ( p_block, DEFAULT_WHERE, l_last_where );
EXCEPTION
     WHEN FORM_TRIGGER_FAILURE THEN
     ref_raise_ftf;
     WHEN OTHERS THEN
     ref_others( 'P-SLQW' );
END;

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/people/prasad.ulagappan2/blog/2005/06/29/java-mapping-part-iii
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/people/sreekanth.babu2/blog/2005/01/05/design-time-value-mappings-in-xslt
/people/anish.abraham2/blog/2005/12/22/file-to-multiple-idocs-xslt-mapping
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/people/pooja.pandey/blog/2005/06/27/xslt-mapping-with-java-enhancement-for-beginners
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