1) The first issue appears only in case TreeGrid has Vertical Scroll.
Issue: TreeGrid with horizontal scroll has the same height as TreeGrid without scroll. It leads to incorrect rows sync at the end of the grid after vertical scrolling to bottom.
2) If TreeGrid has several head rows (two in my case) then TreeGrid will have height = TreeGrid.height - (headRow1.height + headRow2.height). In other words height of TreeGrid reduced by the full height of the header.
There are two issues with TreeGrid height:
1) The first issue appears only in case TreeGrid has Vertical Scroll. Issue: TreeGrid with horizontal scroll has the same height as TreeGrid without scroll. It leads to incorrect rows sync at the end of the grid after vertical scrolling to bottom.
2) If TreeGrid has several head rows (two in my case) then TreeGrid will have height = TreeGrid.height - (headRow1.height + headRow2.height). In other words height of TreeGrid reduced by the full height of the header.