setScrollLeft Not Working Correctly

Hi,

I'm trying to set the default position for the horisontal scroll bar futher right, so am using obj.setScrollLeft(500);

Problem is, the bar does parse 500px in, however a second later it jumps back to the far left! Any ideas?

var obj = new AW.Grid.Extended;
obj.setHeaderCount(4);
obj.setColumnCount(50);
obj.setFixedLeft(4);
obj.setVirtualMode(true);
obj.setScrollLeft(300);
document.write(obj);