Drawing bug when adding records on the fly

Hi;

I use this code within a CXTPReportControl derived control to add a new record to a grouped report control with four group layers:

auto Record=new CMainReportRecord(...);         AddRecordEx(Record);         AdjustScrollBars();

After executing the code, a false line on top of the row is drawn from left edge of the control to the right edge resulting in a visible line within the shaded group area left of the row (see screenshot):

For other records/rows added using AddRecord() and Populate() the output is correct.

I tested the code with toolkit v 19.1 up to 20.3, but all show the same result.

Any idea how to fix this?