Get the creation index from a layer. The creation index will keep unchange for a page.
int GetCreationIndex( )
integer equal or greater than 0 if success, otherwise a negative integer
// Create a layer object and attach it to currently active layer
Layer ly = Project.ActiveLayer();
// If object is valid, Get the CreationIndex and report
if( ly.IsValid() )
printf( "Active layer creation index is %d.\n", ly.GetCreationIndex() );