asp.net - Javascript store not removing all elements before re-adding -

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so have dropdown setup on page called ddlvehicletype populated store. method gets called when dropdown changed, , it's supposed remove items aforementioned store, re-add them needed, , populate dropdown new values.

it's doing it's supposed except clearing store before re-adds values, result is, when switch, i'm getting used plus new values should in there themselves.

here weird thing though, when switch back, values removed without re-adding anything. can tell me i'm doing wrong? method below: 

function filtervehicletypes() {                  var masterstore = global.getcomponent("vehicletypestore").getstore();                 var source = global.getcomponent("ddlvaluationsource").getrawvalue();                 var isincuded = '';                 var includeflags = '';                  if (source == undefined || source == null)                     source = '';                  global.getcomponent("ddlvehicletype").getstore().removeall(false);                   masterstore.each(function(rec) {                      switch (source.touppercase()) {                             case 'kbb':                                 if (rec.get('code') == 'kbb') {                                     global.getcomponent("ddlvehicletype").store.add(rec);                                 }                             case 'nada':                                 includeflags = rec.get('misccode1');                                 if (includeflags != null) {                                  isincuded = includeflags.substr(1, 1);                                     if (isincuded == 'y' && rec.get('code') == 'nada') {                                         global.getcomponent("ddlvehicletype").store.add(rec);                                     }                                 }                                 break;                             default:                                 includeflags = rec.get('misccode1');                                 if (includeflags != null) {                                     isincuded = includeflags.substr(0, 1);                                     if (isincuded == 'y') {                                      global.getcomponent("ddlvehicletype").store.add(rec);                                     }                                 }                                 break;                         }                 });             }

no

break;

in first case. doh!


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