Parameters in Dataextraction

I Inserted a component in my drawing. It containts parameters like Width and Height.
The component was not yet cassified as a window.
I started DataExtraction with only this component selected.
In the wizard, page 3( Properties), I could select all the parameters f.i. Height and Width.
It worked fine.
Then I classified the component as a Window and did the DataExtraction again.
Now I could not select parameters in page 3 of the DataExtraction.

Why can't I extract parameters with DataExtraction when the component is classified ?
I am sure that I am not the only one who wants to have Width and Height of a component in the dataextraction.

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