Flex DataGrid/List Drag and Drop - How to avoid copying -

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i'm using drag , drop on datagrid reorder items. however, when user holds down ctrl can initiate drag copy operation. how can disable copying altogether? (not cancel drop, prevent ctrl + drag showing (+) icon)

this worked me (for spark list):

<s:list dragenabled="true" dropenabled="true" dragmoveenabled="true" dragenter="{event.ctrlkey = false}" dragover="{event.ctrlkey = false}"> ... </s:list>

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