grid rendering speed with little data

I'm using 2.0rc1 on ie6 with 50 rows, 4 columns, and the grid shows blank, then shows the data when I drag the scrollbar thumb from top to bottom, and even somewhere in between. Is this normal for this small size? I think the following statements are ok.

Thanks for any comments.

var obj = new AW.UI.Grid;
obj.setSize(600, 300);
obj.setHeaderText(HeaderText);
obj.setCellText(CellText);
obj.setColumnCount(4);
obj.setRowCount(50);
document.write(obj);