im using eayui v1.4.2
example 1: placeholder is show - OK
=======================
<html>
<input id="kdcust" name="kdcust" class="easyui-combobox" data-options="prompt:'entry nobukti' ">
</html>
<script>
$(function(){
$('#kdcust').combobox('textbox').prop('placeholder', 'entry nobukti');
$('#kdcust').combobox('disable');
$('#kdcust').combobox('enable');
});
</script>
example 2 : placeholder not show

============================================
<html>
<input id="kdcust" name="kdcust" class="easyui-combobox">
</html>
<script>
$(function(){
$('#kdcust').combobox('textbox').prop('placeholder', 'entry nobukti');
$('#kdcust').combobox('disable');
$('#kdcust').combobox('enable');
});
</script>
is there a bug on easyui 1.4.2 or something?
thanks