Multi-valued property with wrong type used when created in relaxed node type

When using the multi-valued property model to create a new property, it uses the wrong property definition in the relaxed node type. This leads to property values being created with the wrong type, e.g. double for string values.

This leads to issues such as

[INFO] [talledLocalContainer] 11.10.2011 16:27:03 ERROR [org.apache.wicket.RequestCycle.logRuntimeException():1529] org.onehippo.forge.selection.frontend.model.ListItem cannot be cast to java.lang.Double
[INFO] [talledLocalContainer] java.lang.ClassCastException: org.onehippo.forge.selection.frontend.model.ListItem cannot be cast to java.lang.Double
[INFO] [talledLocalContainer] at org.hippoecm.frontend.model.properties.JcrMultiPropertyValueModel.setObject(JcrMultiPropertyValueModel.java:144)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.model.properties.JcrMultiPropertyValueModel.setObject(JcrMultiPropertyValueModel.java:54)
[INFO] [talledLocalContainer] at org.apache.wicket.extensions.markup.html.form.palette.Palette.updateModel(Palette.java:516)
[INFO] [talledLocalContainer] at org.apache.wicket.extensions.markup.html.form.palette.Palette$1.updateModel(Palette.java:268)