Not able to select the item in the combo box

Hi,

I have one combo box, I am using this logic to select the item in the combo box.

value is the name of the combo box item.

Sometimes, the item gets selected. But other times only the first item is getting selected. What can be the possible;e reason for that?

for (var index=0;index<reqObj["wItemCount"];index++)
{
if(reqObj["Items"]["Item"](index)["Name"]==value)
reqObj["ClickItem"](index);
}