Redirecting Branches in TTree

Dear Roottalk,

assume I have an object Obj (class MyObj) with two data members data1 and data2 which I store into a TTree.

>MyTree->Branch( "Obj", "MyObj", &Obj )

To read those objects from the tree works perfectly via
>MyObj* Obj=0;
>MyTree->SetBranchAddress( "Obj", &Obj );
>MyTree->GetEntry( i );

So far so good...
I now recalculate data2 and store these results in another TTree which I add as a friend to the first one (e.g. I do a calibration).

Is it now possible to read my objects from the tree, but now with data1 from the original and data2 from the friend tree?

I know I can directly read out the data members via the Branches "Tree1.Obj.data1", "Tree2.Obj.data2" but I would prefer something like the upper, i.e. creating a pointer to my object and telling ROOT where to get the data from.

Thanks a lot for your help

Thomas L.

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Thomas Lauf
MPE - Halbleiterlabor
E-Mail: thl_at_hll.mpg.de