Background image on BlackBerry

I want to have a background image and being able to put LabelField, PasswordEditField or EditField over it.

Unfortun开发者_高级运维ately, only EditField displays properly, but LabelField doesn't display at all. PasswordEditField displayed but with a white background.

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To display a label field, there should be some text set.

LabelField label=new LabelField("Text");

If there is no text, then it won't display anything.