Assert after changing color in GetItemMetrics

In a derived version of CXTPReportRow::GetItemMetrics I am changing the foreground color (clrForeground). The result is however that an assert is raised in CXTPReportRecordItem::Draw because the foreground color is not the default.

Is it correct that I can change the foreground color to a non-default color or is there another way.

ASSERT(pMetrics->clrForeground != XTP_REPORT_COLOR_DEFAULT);