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                // fire enter events
                for (i=0,len=enterEvts.length; i<len; ++i) {
                    // dc.b4DragEnter(e, oDD.id);
                    dragCurrent.onDragEnter(e, enterEvts[i].id);
                }

                // fire over events
                for (i=0,len=overEvts.length; i<len; ++i) {
                    dragCurrent.b4DragOver(e, overEvts[i].id);
                    dragCurrent.onDragOver(e, overEvts[i].id);
                }   

                // fire drop events
                for (i=0, len=dropEvts.length; i<len; ++i) {
                    dragCurrent.b4DragDrop(e, dropEvts[i].id);
                    dragCurrent.onDragDrop(e, dropEvts[i].id);
                }

            }

            // notify about a drop that did not find a target
            if (isDrop && !dropEvts.length) {
                dragCurrent.onInvalidDrop(e);
            }
        },
        
        /**
         * @private
         * Collects the z-index of the passed element, looking up the parentNode axis to find an absolutely positioned ancestor
         * which is able to yield a z-index. If found to be not absolutely positionedm returns -1.
         *
         * This is used when sorting potential drop targets into z-index order so that only the topmost receives `over` and `drop` events.
         *
         * @return {Number} The z-index of the element, or of its topmost absolutely positioned ancestor. Returns -1 if the element is not
         * absolutely positioned.
         */
        getZIndex: function(element) {
            var body = document.body,
                z,
                zIndex = -1;

            element = Ext.getDom(element);
            while (element !== body) {
                if (!isNaN(z = Number(Ext.fly(element).getStyle('zIndex')))) {
                    zIndex = z;
                }
                element = element.parentNode;
            }
            return zIndex;
        },

        /**
        * @private
        * Utility method to pass to {@link Ext.Array#sort} when sorting potential drop targets by z-index.
        */
        byZIndex: function(d1, d2) {
            return d1.zIndex < d2.zIndex;
        },

        /**
         * Helper function for getting the best match from the list of drag
         * and drop objects returned by the drag and drop events when we are
         * in INTERSECT mode.  It returns either the first object that the
         * cursor is over, or the object that has the greatest overlap with
         * the dragged element.
         * @method getBestMatch
         * @param  {DragDrop[]} dds The array of drag and drop objects
         * targeted
         * @return {DragDrop}       The best single match
         */
        getBestMatch: function(dds) {
            var winner = null;
            // Return null if the input is not what we expect
            //if (!dds || !dds.length || dds.length == 0) {
               // winner = null;
            // If there is only one item, it wins
            //} else if (dds.length == 1) {

            var len = dds.length;

            if (len == 1) {
                winner = dds[0];
            } else {
                // Loop through the targeted items
                for (var i=0; i<len; ++i) {
                    var dd = dds[i];
                    // If the cursor is over the object, it wins.  If the
                    // cursor is over multiple matches, the first one we come
                    // to wins.
                    if (dd.cursorIsOver) {
                        winner = dd;
                        break;
                    // Otherwise the object with the most overlap wins
                    } else {
                        if (!winner ||
                            winner.overlap.getArea() < dd.overlap.getArea()) {
                            winner = dd;
                        }
                    }
                }
            }

            return winner;
        },

        /**
         * Refreshes the cache of the top-left and bottom-right points of the
         * drag and drop objects in the specified group(s).  This is in the
         * format that is stored in the drag and drop instance, so typical
         * usage is:
         * <code>
         * Ext.dd.DragDropMgr.refreshCache(ddinstance.groups);
         * </code>
         * Alternatively:
         * <code>
         * Ext.dd.DragDropMgr.refreshCache({group1:true, group2:true});
         * </code>
         * @TODO this really should be an indexed array.  Alternatively this
         * method could accept both.
         * @method refreshCache
         * @param {Object} groups an associative array of groups to refresh
         */
        refreshCache: function(groups) {
            for (var sGroup in groups) {
                if ("string" != typeof sGroup) {
                    continue;
                }
                for (var i in this.ids[sGroup]) {
                    var oDD = this.ids[sGroup][i];