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Create a Schema file Switch to the Design view Expand the Global complex Type D&D a Complex Type from the palette to the Diagram D&D a Sequence from the palette to the Diagram Nothing happens.
I just tried it out and it seem to work as expected. User would be able to drop a compositor only on an element/complextype, provided there is none already. So, after droping a complex type, drop a seq/choice/all on that complex type. You will see that the element now has children (shown by the expand button). Expand the element and you will indeed see the new child compositor.
works fine in build 060719.
Verified in Milestone Build 16.