[jQuery] Problem with class attribute: Why this work in 1.2.6 and doesn't work on 1.3.1???

[AndreMiranda]

Hi everyone!!

Well... for me it's just the same thing, but I don't know why this
works in 1.2.6 and doesn't in 1.3.1:

if ($('.trSelected').length == 2)
{
        alert("hello");
}

In this case, I'm selecting rows on flexigrid and used to work just
fine in 1.2.6.

To work in 1.3.1, I had to do this:

if ($('#flexDiv .trSelected').length == 2)
{
           alert("hello");
}

I had to specify the table from where the trSelected are... why does
this happens??
I'm having too many problems with class attibutes. For example: If I
have 3 input text with class "test", only the first input text is
functional... the other ones no.
Why?
thanks!!!