Null value in extension class method

Hi All,

I have created the Post event handler for PurchFormLetter/main method... In that extension class, i am unable to the instance of PurchFormletter...It is my code...

[PostHandlerFor(classStr(PurchFormLetter), staticMethodStr(PurchFormLetter, main))]
    public static void PurchFormLetter_Post_main(XppPrePostArgs args)
    {
        AxFSAServicePartRequestQueue axFSAServicePartRequestQueue;
        #fsa
        PurchTable purchTable;
        PurchFormLetter purchformLetter = args.getThis() as PurchFormLetter;
        purchTable = purchFormLetter.parmSourceTable();
    }

Here i am getting null value for 'purchformLetter'...

Please suggest..?

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