Problem in dynamically generating the file upload field

Hello all
I am using netbeans 5.5 and visualwebpack for my jsf project.
i have a problem in dynamically generating the file upload field and using it.
I have a panel say "panelA" which holds file upload fields.
Depending upon the count value i generate the file upload field using following code snippet:
Upload upload1 = new Upload();
upload1.setId("upload1");
getPanelA.getChildren().add(upload1);
The page successfully shows up the file upload fields. While the user clicks the submit button, i have used following logic to perform upload:
List components = getPanelA().getChildren();
for(int i = 0; i<components.size(); i++){
if(components.get(i) instanceof Upload){
UploadedFile uploadedFile = ((Upload)components.get(i)).getUploadedFile();
I am getting this UploadedFile object null.
How can i solve this problem.

Anyway,
I solved the problem.
Actually i was using label property of the upload field due to which i got null pointer exception.
I removed the label property of the upload field and things worked as i wanted.

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