[TYPO3-dev] Flexform select list - editing?

[B.Wolf]

Hi there,

For a frontend plugin I want to use a flexform select list. Here's the 
markup:

<view_record>
	<TCEforms>
		<label>Staff members to show</label>
		<config>
			<type>select</type>			 					<foreign_table>tx_mitarbeiter</foreign_table>
			<multiple>0</multiple>
			<size>3</size>
			<maxitems>0</maxitems>
		</config>
	</TCEforms>
</view_record>


When I create a new plugin in the page module, the  selectbox is 
alright: I can select the records in the right list field and move them 
to the left list field.
But when I save record and edit it again, I get just a simple selectBox, 
  with no option to delete or add items.
Why?

Thanks a lot,
greets ben