how can i rename item of rootitem in premiere project and move this item to a bin by actionscript

I use this code in my button:

var prj:Project = Premiere.app.project;
var arr:Array = new Array();
arr[0] = "c:\abc.mp4"
prj.importFiles(arr);

Premiere project add an item named "abc.mp4" but i want display this item with name like "somethingiwant.mp4".

and then i create bin by:

prj.rootItem.createBin("tempbin");

i want move the clip into this bin.

I can not do these, help me please !!