Comments on: This isn’t right… MovieClip nested inside Button throwing null object reference error in Flash CS4

By: Harr Kunz

Harr Kunz — Wed, 10 Mar 2010 03:20:08 +0000

This also happens in CS3. That’s an AS3 bug perhaps within the Timeline Object.

By: ranvir singh

ranvir singh — Fri, 19 Feb 2010 07:33:49 +0000

how can work btn whthin movieclip ,can send me a fla file

By: Must read for beginning actionscripters! « Steve’s Design and Development Blog

Wed, 10 Feb 2010 00:10:34 +0000

[...] http://blog.anselmbradford.com/2009/09/10/this-isnt-right-movieclip-nested-inside-button-throwing-nu... [...]

By: FlashSlayer

FlashSlayer — Tue, 09 Feb 2010 23:03:56 +0000

Thank…you…so…much
I’ve been pulling my hair out over this issue for hours on end. Tried the third solution, worked for me.

By: dave

dave — Fri, 22 Jan 2010 20:21:20 +0000

The problem might be this:
mouseChildren = false;

http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/DisplayObjectContainer.html#mouseChildren

“This property is useful when you create a button with an instance of the Sprite class (instead of using the SimpleButton class). When you use a Sprite instance to create a button, you can choose to decorate the button by using the addChild() method to add additional Sprite instances. This process can cause unexpected behavior with mouse events because the Sprite instances you add as children can become the target object of a mouse event when you expect the parent instance to be the target object. To ensure that the parent instance serves as the target objects for mouse events, you can set the mouseChildren property of the parent instance to false.”

Also noted here:
http://numiko.com/labs/?p=223

By: Flo

Flo — Fri, 15 Jan 2010 23:20:35 +0000

Thank you!!! I looked for this problem 2 houres and that’s the solution!!!! Thanks a lot!!!

By: Ans

Ans — Fri, 15 Jan 2010 05:00:09 +0000

Cheers Steve, glad it helped you out!

By: steve

steve — Thu, 14 Jan 2010 09:06:07 +0000

Hi i also just tried your third workaround and it did the trick.
I just don’t know how to thank you enough for this tip, as this has puzzled me and kept me awake all night many times. This is such a relief to learn it wasn’t all me!!! I knew i wasn’t referencing something that wasn’t there! Thank You thank you thank you!! Now i can go back to using mc’s in my buttons without fear!

By: ARD

ARD — Mon, 14 Dec 2009 19:20:09 +0000

Thanks a bunch for this. This one little error has been holding me up for a while now.

By: hols

hols — Thu, 26 Nov 2009 03:03:17 +0000

omg i love you so much. been annoyed with this all night. the 3rd workaround worked best for me.
cheers