HPCC-11587 Add 'Open In New Page' to Package Map area

The code for the Package Map display is upgraded to support
the function of 'Open In New Page'.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
You can remove:
{code}
if (this.initalized)
                  return;
{code}
as it is handled in the _widget base class you are now calling via inherited.