mouseChildren & mouseEnabled problem

programming flash
1

i have a class that extends sprite.
in that class i make an instance of a movieclip simbol from the library.
i also set some other properties like:

_popup = new PopupMC();
addChild(_popup);
_popup.alpha = 0;
_popup.mouseChildren = false;
_popup.mouseEnabled = false;
_popup.popup_txt.autoSize = TextFieldAutoSize.LEFT

on my timeline i do this:

import com.zerro.utils.Popup;
var popup:Popup = new Popup( myXML );
addChild(popup);

now, before that was a class (with some other code as well) this mouseChildren & mouseEnabled worked normally.
basically i needed to disable that movieclip so that it doesnt interfere with the mouse.

now that i have made a class out of it this mouseChildren & mouseEnabled doesnt work.
i go it to work accidentally by doing this:

import com.zerro.utils.Popup;
var popup:Popup = new Popup( myXML );
addChild(popup);
**popup.mouseEnabled = false;
popup.mouseChildren = false;**

and this is the first time i have experienced something like that :smiley:
adding properties like that on that instance, it this normal?
… because i havent sleeped well last night :smiley:

i dont get it why doesnt it work when i set this in a class, because setting

_popup.alpha = 0;

does work.