How To get selected row in a table

Hi experts
I have been using a table in which I am using a column Tree by nesting . I have written code for dynamically expanding table tree . But I want to know current selected element of the table, for this i have done following
steps
1) created an action on Action lead select of the table .
which has a parameter with type node element .
2) now i need to use parameter mapping in domodify view .
as
IWDTable tab = (IWDTable) view.getElement("CatalogTable");
tab.mappingOfOnLeadSelect().addSourceMapping("XYZ", "element");
But i dont know what is correct parameter XYZ to be passed.
also if i am wrong in approach please let me know .
Regards
Abhay

Hi
 I have used following code also but its not working
IWDTable table = (IWDTable) view.getElement("CatalogTable");
table.mappingOfOnLeadSelect().addSourceMappin ("IWDNodeElement", "LeadSelect");
and I have created an action
public void onActionOnleadSelect(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent, com.sap.tut.wd.treetable.wdp.IPrivateTreeTableView.ICatalogElement LeadSelect )
 //@@begin onActionOnleadSelect(ServerEvent)
 wdContext.currentContextElement().setDebug4(LeadSelect.getID());
 //@@end
but when i select one row its giving error
com.sap.tc.webdynpro.services.exceptions.WDIllegalArgumentException: Parameter IWDNodeElement not found

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