Attachmovieclip problem

Hello all,

What i want is to attach a movieclip that is attached to the _root.

Here is what I have,

function component(label)
{
_root.attachMovie("roundledcomponent", "roundledcomponentHolder",
this.getNextHighestDepth());
_root.roundledcomponentHolder._x = 100;
_root.roundledcomponentHolder._y = 100;

_root.roundledcomponentHolder.attachMovie("up", "upHolder",
this.getNextHighestDepth());
_root.roundledcomponentHolder.upHolder._apha = 50;
} //end function component


I am sure the properties for roundledcomponent and up are ok, i do get the
roundledcomponent.. the up wont attach to the roundledcomponent.

Any ideas?

regards,
Peter