Hi everyone,

the attached ChangeSet includes changes to the Object Explorer. 
If anyone finds the time for reviewing it the following is in there:

- Fixes and issue with the object explorer not updating on clicking a selected
entry correctly if the tree item was created through explorerContents
- Moved the logic of how to extract tree items from arbitrary objects to an extension
method in Object
- Adds drag and drop support to the object explorer
- Adds a way to specify a double click handler method in PluggableTreeSpecs

Thanks and bests
Patrick
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