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var HEADER = Ext.ComponentQuery.query('#ELEMENT')[0];

Ext.Ajax.request({
        url: 'BESTAND.BESTAND',
        success: function(response, opts) {
            var obj = Ext.decode(response.responseText);
            if (obj.success == true) {
                HEADER.setTitle('BLABLA' + obj.periode);
            }
        },
        scope: this
})