Creating Hierarchical ArrayCollection out of Flat Array Collection where each record has three fields ID, Name, PID (say)

Here my flat array collection was having three fields ZZCUST_VEND (ID),ZZNAME (name),ZZHCUST_VEND(PID) and sample data would be like

            var flatArrayCollection:ArrayCollection = new ArrayCollection([
            {ZZCUST_VEND:"1", ZZNAME:"A", ZZHCUST_VEND:"0"},
            {ZZCUST_VEND:"2", ZZNAME:"B", ZZHCUST_VEND:"0"},
            {ZZCUST_VEND:"3", ZZNAME:"C", ZZHCUST_VEND:"0"},
            {ZZCUST_VEND:"4", ZZNAME:"D", ZZHCUST_VEND:"0"},
            {ZZCUST_VEND:"5", ZZNAME:"A1", ZZHCUST_VEND:"1"},
            {ZZCUST_VEND:"6", ZZNAME:"B1", ZZHCUST_VEND:"2"},
            {ZZCUST_VEND:"7", ZZNAME:"C1", ZZHCUST_VEND:"3"},
            {ZZCUST_VEND:"8", ZZNAME:"A11", ZZHCUST_VEND:"5"},
            {ZZCUST_VEND:"9", ZZNAME:"B11", ZZHCUST_VEND:"6"},
            {ZZCUST_VEND:"10", ZZNAME:"C11", ZZHCUST_VEND:"7"},
            {ZZCUST_VEND:"11", ZZNAME:"D1", ZZHCUST_VEND:"4"},
            {ZZCUST_VEND:"12", ZZNAME:"D11", ZZHCUST_VEND:"11"},
            {ZZCUST_VEND:"13", ZZNAME:"E", ZZHCUST_VEND:"0"},
            {ZZCUST_VEND:"14", ZZNAME:"E1", ZZHCUST_VEND:"13"},
            {ZZCUST_VEND:"15", ZZNAME:"C12", ZZHCUST_VEND:"7"},
            ]); 

I want to show this in a hierarchical fashion. So I created a Tree Utility class to handle this.The post is available at here.

I hope this will be helpful.