diff --git a/bricks/popup.js b/bricks/popup.js
index 7eb4298..6fe85d4 100644
--- a/bricks/popup.js
+++ b/bricks/popup.js
@@ -161,8 +161,10 @@ bricks.Popup = class extends bricks.VBox {
 		this.current_width = this.current_width || this.get_width();
 		this.current_height = this.current_height || this.get_height();
 		this.resize_status = true;
-		bricks.app.bind('mousemove', this.resizing_bound = this.resizing.bind(this));
-		bricks.app.bind('mouseup', this.stop_resizing_bound = this.stop_resizing.bind(this));
+		document.addEventListener('mousemove', 
+				this.resizing_bound = this.resizing.bind(this));
+		document.addEventListener('mouseup', 
+				this.stop_resizing_bound = this.stop_resizing.bind(this));
 		console.log('= resize_stat_pos()', this.origin_event_x, this.origin_event_y)
 	}
 	resizing(e){
@@ -209,8 +211,11 @@ bricks.Popup = class extends bricks.VBox {
 		this.resize_status = false;
 		this.is_resizing = false;
 		this.forget_event_pos();
-		if (this.resizing_bound) bricks.app.unbind('mousemove', this.resizing.bind(this));
-		if (this.stop_resizing_bound) bricks.app.unbind('mouseup', this.stop_resizing.bind(this));
+		if (this.resizing_bound) 
+			document.removeEventListener('mousemove', this.resizing_bound);
+		if (this.stop_resizing_bound) 
+			document.removeEventListener('mouseup', this.stop_resizing_bound);
+
 		console.log('= stop_resizing() called ');
 	}