Created attachment 149358 [details]
IDE log

Please try following:

JS file:
function SimpleMode(){
    var self = this;
    this.pureName = ko.pureComputed(function(){
        return "<b>"+self.name+" "+lastName+"</b>";
    });

}
ko.applyBindings(new SimpleMode());


and in HTML file:
...

<div data-bind="template: {name 'a', data : |}
...


and invoke code completion at place of "|"
=> pureName is not offered. It is if the data-bind attr is closed

<div data-bind="template: {name 'a', data : |}"


Thank you

Product Version: NetBeans IDE Dev (Build web-main-1301-on-20140919)
Java: 1.8.0_20; Java HotSpot(TM) Client VM 25.20-b23
Runtime: Java(TM) SE Runtime Environment 1.8.0_20-b26
System: Linux version 3.13.0-35-generic running on i386; UTF-8; en_US (nb)