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Source Code
dragtree.zip
Power++ Sample of drag & drop in a treeview
multisel.zip
This is a sample which demonstrates how to use arrays as arguments to DataWindows. The trick is to pass a WVariant argument to the Retrieve method of the DW. This argument must be created from WSafeArray. Each element of this array is of type WVariant. Big thanks for this one to Jan Zajac who provided the clues.