Hi,
you can press F1 on lead selection and can see what is the purpose.
If the selection of a context node is not empty at runtime, exactly one of these selected elements (one
the table rows) has a prominent status.It is known as the lead selection.
The property "Initialize Lead Selection" specifies whether the lead selection is to be set automatically
as soon as it is needed but is not set yet.
Lead selection matters very prominently when the content of the child node with the property
"Singleton" depends on the lead selection element of its parent node.
Defaut: Yes (Set Lead Selection Automatically).
Thanks
Vijay Vikram