Blank entry removed from af:selectOneChoice drop down on valueChangeListene

I am using af:selectOneChoice component which is getting populated with values from DB. when the page is loaded first time, I can see one blank entry in this component. I have valueChangeListener set on this. when i change the value, the blank entry is removed.
Can anyone help me with the reason or how can i retain that blank entry.

Hi I am using following code for jsp page:
<af:selectOneChoice id="xyz" valueChangeListener="#{abc.xyzChanged}" value="#{abc.strxyz}" autoSubmit="true" styleClass="formfield">
<f:selectItems value="#{abc.arrayList}"/>
</af:selectOneChoice>
Following is the code in BKB class which populates this drop down:
                    AttributeValuesDTO attributeValuesDTO =
                         (AttributeValuesDTO)attrList.get(i); //attrList is list of values fetched from DB
                    arrayList.add(
                              new SelectItem(
                                        attributeValuesDTO.getAttributeValue(),
                                        attributeValuesDTO.getAttributeValue()));
I think that adding an extra blank entry is feature of af:selectOneChoice (please correct me) however that extra blank entry is removed when i trigger an action on valueChangeListener for af:selectOneChoice.

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Blank entry removed from af:selectOneChoice drop down on valueChangeListene

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