How to set fixed size for inputfile text field

Hi all,
I am using inputfile component to test file uploading so I created a simple upload page. When I finished upload the file, the input text field will "shrink" its size and change the size to adjust the file name. Is there any way to set a fix size for input text field?
Here is some part of the code:
<af:form id="f1" usesUpload="true">
<af:panelHeader text="File Uploader" id="ph1">
<af:inputFile label="File to upload" id="if1" autoSubmit="true" valueChangeListener="#{fileBean.fileUpdate}"
value="#{fileBean.file}" partialTriggers="if1"
columns="50"/>
</af:panelHeader>
<af:commandButton text="Save" id="cb1"/>
FileBean:
public void fileUpdate(ValueChangeEvent valueChangeEvent) {
RichInputFile inputFileComponent = (RichInputFile)valueChangeEvent.getComponent();
UploadedFile newFile = (UploadedFile)valueChangeEvent.getNewValue();
UploadedFile oldFile = (UploadedFile)valueChangeEvent.getOldValue();
Thanks,
Jerry

you can set columns attribute in af:inputfile. Please see highlighted area i have inserted to you code
<af:form id="f1" usesUpload="true">
<af:panelHeader text="File Uploader" id="ph1" columns = "34" >
<af:inputFile label="File to upload" id="if1" autoSubmit="true" valueChangeListener="#{fileBean.fileUpdate}"
value="#{fileBean.file}" partialTriggers="if1"
columns="50"/>
</af:panelHeader>
<af:commandButton text="Save" id="cb1"/>

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