combobox w/out loading and w/out list

[genius551v]

Hello,
I have this:

var search = new Ext.form.ComboBox({
        displayField:'title',
        .
        .
        .
        loadingText: ''
});

and i get this:
in FF: attach #1
in IE: attach #2

and that is ok, so i glad to know how can i do to have a combobox w/out list just something like this:
attach #3

is the same way just like Ext JS Forums - Search Forums - Search by User Name

can somebody help me?

tnks in advance