FindVisibleRect
if (FindVisibleRect(row, &invalidRect))
bool FindVisibleRect(BRow* row, BRect* _rect);
FindVisibleRect(fFocusRow, &fFocusRowRect);
FindVisibleRect(fFocusRow, &fFocusRowRect);
FindVisibleRect(fFocusRow, &fFocusRowRect);
if (FindVisibleRect(row, &invalidRect))
if (FindVisibleRect(parentRow, &parentRect))
&& FindVisibleRect(parentRow, &parentRect))
FindVisibleRect(fFocusRow, &fFocusRowRect);