using radio button date fields range

hi Experts,

         i used 2 datefileds for date to date comparison and 2 datefileds for week to date comparison  ,but when i used 2nd datefilds its not cleared old values...main source is BEx query variables for DTD and WTD

      my code ,im using like this..

if(RADIOBUTTONGROUP_1.getSelectedValue() =='Date To Date')

{

//DS_1.clearAllFilters();

DATEFIELD_CURRENT_FROM.setVisible(true);

DATEFIELD_CURRENT_TO.setVisible(true);

DATEFIELD_CURRENT_FROM_D.setVisible(false);

DATEFIELD_CURRENT_TO_D.setVisible(false);

}

else

{

//DS_1.clearAllFilters();

DATEFIELD_CURRENT_FROM_D.setVisible(true);

DATEFIELD_CURRENT_TO_D.setVisible(true);

DATEFIELD_CURRENT_FROM.setVisible(false);

DATEFIELD_CURRENT_TO.setVisible(false);

}

refresh button

var varDate = DATEFIELD_CURRENT_FROM.getDate() + " - " + DATEFIELD_CURRENT_TO.getDate();

var varDate1 = DATEFIELD_CURRENT_FROM_D.getDate() + " - " + DATEFIELD_CURRENT_TO_D.getDate();

APPLICATION.setVariableValueExt("ZWDAT_UNI_DTD", varDate);

APPLICATION.setVariableValue("ZWDAT_UNI", varDate1);

thanks in advance...

Ashwin