Thank you . It turned out like this:
$.fn.combobox.defaults=$.extend({}, $.fn.combobox.defaults, {
valueField: 'id',
textField: 'name',
mode: 'remote',
method: 'get',
delay: 604800000,
selectOnNavigation: false,
hasDownArrow: false,
inputEvents: $.extend({}, $.fn.combo.defaults.inputEvents, {
keyup: function(e){
if (e.keyCode == 40 && e.altKey){
var _text = $(e.data.target).combobox('getText');
$(e.data.target).combobox('reload','/Scripts/get_org.php?org_text='+_text)
.combobox('showPanel')
.combobox('setValue', _text);
}
}
}),
icons:[{
iconCls: 'icon-down-arrow',
handler: function(e){
var _text = $(e.data.target).combobox('getText');
$(e.data.target).combobox('reload','/Scripts/get_org.php?org_text='+_text)
.combobox('showPanel')
.combobox('setValue', _text);
}
}]
});
I had to hide the standard icon and add the desired icon into css