the first,I'm sorry my English is very poor.

I am make a chatsystem with scrollview,but there are some problem I can't solve. so I want help from you.my ngui version is 3.49.
the ngui chat example is too Simple for me,I want make it like QQ,other speak at left,ourself speak is right,so I used a scrollview and grid.the next step I use Nguitoos.addchild() to the grid, the first child at the scrollview top is normal,with many speak the scorllview current page is full,i want the scrollview show my current speak,so it need scroll.as we know,use scrollview.respositon() will reset positon to the top,but here I want it to bottom.I used springPanel.begin(),but Position still have deviation.I used CenterOn(),it can't ,I add a scrollbar and set
it alpha=0,next set the value=1,the strange thing happened,the value after value=1 back to 0.8....now,how can I do...