The NGUIMath.CalculateAbsoluteWidgetBounds Question

[shokinhan]

I invoke the function NGUIMath.CalculateAbsoluteWidgetBounds("Tran") and the result named Pos1. Then I add new uiwidge to the window, invoke that funciton  again , and the result named Pos2.

So Pos1 must not equals Pos2 ?