WDPortalEventing.subscribe not working

Hi experts ,

Im rasing an event in my portal component mast head .

ie.

var sessionID =

<%=getSessionID(componentRequest)%>;

EPCM.raiseEvent('urn:*******.portal_dev', 'getSessionID', sessionID);

and in my webdynpro dc im using the below code to get the value from the sessionID

WDPortalEventing.subscribe("urn:*****.portal_dev","getSessionID",wdThis.wdGetDummyAction());

but it is not working , i mean the action is not getting executed , as well as im not able fetch the data in variable sessionID being passed

please suggest a solution

Regards

Govardan Raj