diff --git a/ui/ui.core.js b/ui/ui.core.js
index 4afd2066f..c77e99999 100644
--- a/ui/ui.core.js
+++ b/ui/ui.core.js
@@ -370,20 +370,13 @@ $.widget.prototype = {
 			eventName = (type == this.widgetEventPrefix
 				? type : this.widgetEventPrefix + type);
 
-		// event can be null, a hash, a native event, a fixed event
-		event = event ? $.extend(event, $.Event()) : $.Event();
+		event = $.Event(event);
 		event.type = eventName;
 
 		this.element.trigger(event, data);
-		var callbackResult = callback
-			? callback.call(this.element[0], event, data)
-			: undefined;
-		
-		event.result = callbackResult !== undefined
-			? callbackResult
-			: event.result;
-		
-		return event.result !== false;
+
+		return !(callback && callback.call(this.element[0], event, data) === false
+			|| event.isDefaultPrevented());
 	}
 };
 
diff --git a/ui/ui.draggable.js b/ui/ui.draggable.js
index 8eb60b56c..15d6cf440 100644
--- a/ui/ui.draggable.js
+++ b/ui/ui.draggable.js
@@ -125,7 +125,11 @@ $.widget("ui.draggable", $.extend({}, $.ui.mouse, {
 		this.positionAbs = this._convertPositionTo("absolute");
 
 		//Call plugins and callbacks and use the resulting position if something is returned
-		if(!noPropagation) this.position = this._trigger("drag", event) || this.position;
+		if (!noPropagation) {
+			var ui = this._uiHash();
+			this._trigger('drag', event, ui);
+			this.position = ui.position;
+		}
 
 		if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
 		if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';
@@ -368,11 +372,11 @@ $.widget("ui.draggable", $.extend({}, $.ui.mouse, {
 
 	// From now on bulk stuff - mainly helpers
 
-	_trigger: function(type, event) {
-		$.ui.plugin.call(this, type, [event, this._uiHash()]);
+	_trigger: function(type, event, ui) {
+		ui = ui || this._uiHash();
+		$.ui.plugin.call(this, type, [event, ui]);
 		if(type == "drag") this.positionAbs = this._convertPositionTo("absolute"); //The absolute position has to be recalculated after plugins
-		$.widget.prototype._trigger.call(this, type, event, this._uiHash());
-		return event.returnValue;
+		return $.widget.prototype._trigger.call(this, type, event, ui);
 	},
 
 	plugins: {},