Destroy method is not removing the refernce....even remove is not working for x-panel type reference......

remove is removing the component from parent panel very properly but not removing the reference...its reference exist even after removing the component from parent...remove is just setting the isDestroyed property to true..

if i continue without destroying or removing...... i get Uncaught-TypeError-Cannot-read-property-className-of-undefined error....while dragging draggable items on the page....

if i tried opening that page directly....then its working fine......if tried opening with last page reference then i got Uncaught-TypeError-Cannot-read-property-className-of-undefined

plzzz suggest...