How to determine if a given composite activity is a custom activity

When walking the workflow’s activity tree, you’ll encounter all the child activities of composite activities including, the children that were dropped into activity.xoml or activity.cs of  the composite activity. If you ever need to find just  the activities dropped into the current workflow, and not the ones indireclty in the tree throgu the custom activities, here is what you can do.
Ignore an activity if somewhere in its path to the root exists a composite such that, an instance of that composite activity type when created using activator create instance ,has child activities in it already.
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