isTweening broken?

function doesn't recognize property

[matthewwithanm]

ref.tween("_x", 250, 5, "linear");
var tmp = ref.isTweening("_alpha");

When I run the above code, tmp gets a TRUE value. Why? The only property I'm tweening is "_x". It's as if the function ignores the paramater altogether.

Thanks for the help,
matthew