Hiển thị popup chọn file trong joomla

Lựa chọn file
C1: http://www.richardbutterworth.co.uk/blog/19-the-joomla-media-form-field
C2:
<field
            name="yourfile"
            type="filelist"
            label="COM_EXAMPLE_FIELD_YOURFILE_LABEL"
            description="COM_EXAMPLE_FIELD_YOURFILE_DESC"
            directory="images/mail_attach"
            hide_none="true"
            <!--hide_default="true"
            filter="\.pdf$"-->
        />

upload file trực tiếp
C3:https://docs.joomla.org/Creating_a_file_uploader_in_your_component
C4: http://stackoverflow.com/questions/15653414/file-upload-form-for-custom-joomla-component