Release Notes:

1.15.4.1

[New] Added CellContainer.FillCellWidth and FillCellHeight properties to replace reliance on defunct LockLeft,LockTop etc.
[Bug] SnapToRowTops now more reliable and accurate
[Bug] Scrolling lag corrected when paintEmptyRows=true or using Gridlines
[Bug] Empty rows now respect Column.DefaultColumnSpan property
[Bug] CellContainer insets corrected for heirarchical lists