Shifting ActiveItem from CXTPReportControl

Maybe it was wrong question that I asked before. I'm sorry for that.
Let me try to ask correctly.

There is a report control and it has 5 item(row)s.
Click first row, it turns to blue and outlined with gray dotted line.
Click last row(5th row) holding shift key, all 5 rows turn to blue and the rectangle(shown in gray dotted line) moves to 5th row.
Only one gray dotted rectangle is shown and it moves whenever click an item or press up/down keys.

I wander, how to get the row shown in gray dotted rectangle, also how to set a row as a gray dotted one.
(What it calls? default selected item?)