How to override CellTree's resources in UiBinder?

[Blackberet]

This is not working;

   <ui:style>
 
@external .cellTreeWidget, .cellTreeEmptyMessage, .cellTreeItem, 
.cellTreeItemImage, .cellTreeItemImageValue, .cellTreeItemValue, 
.cellTreeOpenItem, .cellTreeClosedItem, .cellTreeTopItem, 
.cellTreeTopItemImage, .cellTreeTopItemImageValue, 
.cellTreeKeyboardSelectedItem, .cellTreeSelectedItem, .cellTreeShowMoreButton;
...
        .cellTreeWidget {
                        border: solid 1px #ff0000 !important;
        }
        .cellTreeEmptyMessage {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeItem {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeItemImage {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeItemImageValue {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeItemValue {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeOpenItem {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeClosedItem {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeTopItem {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeTopItemImage {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeTopItemImageValue {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeKeyboardSelectedItem {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeSelectedItem {
                border: solid 1px #ff0000 !important;
        }
        .cellTreeShowMoreButton {
                border: solid 1px #ff0000 !important;
        }
...

thanks

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