Visibility issue

I’m simply trying to hide two buttons onRollOver of one

this.varBut.onRollOver = function() {
_root.gotoAndStop(7);
statBut._visible = false;
varBut._visible = false;
};

varBut does what I’d like it to but statBut doesn’t, I’ve tried
_parent.statBut._visible = false; and
_root.statBut._visible = false;
but neither work, any help would be greatly appreciated.