Interaction between MC's

Question

Ok, i have a scene, the background is a movie clip named
"landscape_mc" which is an animation stopped on frame 1.
on a layer above that i have another movieclip named
"navigate_mc",within this movieclip i have a set of buttons.
What i'd like to be able to do is when i click on one of
these buttons it goes to frame 39 of the "landscape_mc" movieclip.
the movieclip "navigate_mc" is also set to be draggable.
ive tried a few things but keep getting "Access of undefined
property" errors. Im guessing because my button instances names are
set within its own movieclip that it doesnt recognise them when
playing the scene.
heres my code:
navigate_mc.addEventListener(MouseEvent.MOUSE_DOWN,
mouseDownHandler);
navigate_mc.addEventListener(MouseEvent.MOUSE_UP,
mouseReleasedHandler);
function mouseDownHandler(e:MouseEvent):void {
navigate_mc.startDrag();
function mouseReleasedHandler(e:MouseEvent):void {
navigate_mc.stopDrag();
portal_btn.addEventListener(MouseEvent.CLICK,gotoframe);
function gotoframe(evt:Event):void {
landscape_mc.gotoAndStop ("39");
stop();
im fairly new to AS3 so im hoping theres a simple fix :)
many thanks in advance

Answer 1

If that code is in the timeline that contains landscape_mc
and the navigate_mc, then need to target the buttons thru
thenavigate_mc.
navigate_mc.portal_btn.addEventListener(MouseEvent.CLICK,gotoframe);
With those mouse events assigned to the navigate_mc, it will
be blocking mouse access to the buttons.