Hello everyone,

I use Ext.tree.ViewDDPlugin in my Ext.tree.Panel like this:

Code:
var treePanel = Ext.create('Ext.tree.Panel', {
        id: 'tree-panel',        
        enableDragDrop: true,
        ddGroup: 'TreeDD',
        ddText : 'Place this row.', 
        copy: true,
        layout: 'fit',
        rootVisible: false,
        store: treeStore,
        root: {
            nodeType: 'async',
            id: 'rootId',
        },
        allowCopy: true,
        viewConfig: {
            enableDrop: false,
            plugins: {
                ptype: 'treeviewdragdrop',
                appendOnly: true,
                dragGroup: 'TreeDD',
                allowCopy: true,
                copy: true
            }
        }
    });
I want to drag leaf nodes from tree to grid and leaf nodes should stay in tree. But now they are removes.

What should I do and where I can set COPY property to true?