[TYPO3-mvc] FED - flux:flexform.field.group type file - no browse field?

[Alexander Dick]

Hi,

I created a content element with an upload field, but the "browse" 
button doesn't get displayed.

Screenshot: http://img3.imageshack.us/img3/3499/fedupload.jpg

my field config:

<flux:flexform.field.group
	label="Bild"
	name="image"
	internalType="file"
	showThumbs="1"
	size="1"
	uploadFolder="uploads/tx_fluxfce/"
	maxItems="1"
	allowed="jpg,jpeg,png,gif,pdf"
	required="1"
/>

the uploadFolder exists.

what's wrong here?

TYPO3 4.7.2
fed 4.7.0


Thanks
Alex