How to Style ButtonCell in CellTable Gwt?

How to Style ButtonCell in CellTable Gwt?

I searched on internet & found 2 solutions:

-Solution 1: use urColumn.setCelLStyleNames("yourStyleName"); (Adding style to a ButtonCell)

ButtonCell nextStepButton=new ButtonCell();  Column<String[], String> nextStepColumn = new Column<String[], String>(nextStepButton) {            @Override          public String getValue(String[] oneOrder) {              return oneOrder[11];          }  };  nextStepColumn.setCellStyleNames(getView().getRes().css().buttonCell());  

in CSS

.gwtButton, .buttonCell.getButton {    margin: 0;    padding: 5px 7px;    text-decoration: none;    cursor: pointer;    cursor: hand;    font-size:small;    background: black;    border:1px solid #bbb;    border-bottom: 1px solid #a0a0a0;    border-radius: 3px;   -moz-border-radius: 3px;    color: white;    }  

I tried but nothing happened.

-Solution2: modify ButtonCell (https://code.google.com/p/google-web-toolkit/issues/detail?id=7044)

               ButtonCell nextStepButton=new ButtonCell(){                      // A native button cell doesn't have the gwt-button class, which makes it                        // look weird next to other gwt buttons. Fix that here.                        @Override                        public void render(                            final Context context,                            final SafeHtml data,                            final SafeHtmlBuilder sb) {                          sb.appendHtmlConstant("<button type=\"button\" class=\"gwt-Button\" tabindex=\"-1\">");                          if (data != null) {                            sb.append(data);                          }                          sb.appendHtmlConstant("</button>");                        }                  };  

for the solution2, i can see the difference (ie the Style of ButtonCell got changed). However, I don't have "gwt-Button" css class but only have "gwtButton" css class (see the above css). However, when I change "gwt-Button" to "gwtButton" in the the 2nd code sb.appendHtmlConstant("<button type=\"button\" class=\"gwtButton\" tabindex=\"-1\">"); then nothing happened.

So, How to style Button cell so that it can pick up the gwtButton css class

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