All features in the layer from feature service are invisible in the Flex Viewer

I create feature service wirh 2 layers. But all features in the 1 layer are invisible. I can see feature's attributes only in attribute table.

I add new feature in this layer and I can see this feature in ArcMap, but not Flex Viewer.
I can see feature in this layer from feature service in Silverlight Viewer only when this feature is selected.

Any help please.

Thanks