Listselect with scrollbar

Hi,

I cant able to focus selected value in ListSelect .

For Example:

Listselect contains values like,
A
B
C
.
.
Z
With scrollbar.
1.Select the value from ListSelect it will place the selected value into textfield.
Example:Selected value of “M” from listselect and its placed the value “M” in textfield.Whatever we select the value its placed in textfield.(Value “M” is placed in middle of the listselect)
2.Now I’m going to click the textbox its focusing on Listselect.But we have to scroll down and look on that value.
Code:
TextField txt=new textField();
Listselect ls=new Listselect();
ls.select(txt.getvalue);
ls.setimmediate(true);

I have to get scroldown and look the value “M”
I have to fix like defaultly focus the value in listselect without user scroll it down.

Please help me anyone to find the solution!

Thanks,
Madhuadithya