getSelectedRegion
Get the selected region.
getSelectedRegion([out] LONG *regionHandle, [out, retval] VARIANT_BOOL *isSelection)
This function returns the handle of the currently selected region, or
zero if no region is selected.
VB:
Dim region As Long
If viewer.getSelectedRegion(region) <> 0 Then
' do something with the region ...
Else
' no region is currently selected ...
End If