IS_CHANGED_BY_CLIENT( ) ISSUE

I'm re-using the alv component of SAP in order to display ALV_GRID within web dynpro for abap....

The method is changed by client on the if_WD_context element is working really nice.

Unfortunatly when I change the sorting of the alv ( using headerclick ) it appears this method is always returning false....

Really problematic to me.

Any has had the same issue ?

Regards

Stephan K.