How to style ClickableTextCell Column that was rendered as Image Column (GWT)?

I want to have an Image Column in Celltable. I don't want to use ImageResource to do that cos it got problem with the Location of Image & I can't use setFieldUpdater. So i used "ClickableTextCell Column that was rendered as Image Column" like the following:

     String[] msg={"12","love","image/icon/delete.jpg"}       Column<String[], String> deleteColumn=new Column<String[], String>(new ClickableTextCell(){                public void render(Context context,                       SafeHtml value,                       SafeHtmlBuilder sb)               {                    sb.appendHtmlConstant("<img width=\"20\" src=\""                                          + value.asString() + "\">");               }         }){                @Override              public String getValue(String[] object) {                  // TODO Auto-generated method stub                  return object[3];              }         };         deleteColumn.setCellStyleNames(getView().getRes().css().gwtCellImage());  

in css:

.gwtCellImage button{        background-image:url('/images/icon/delete.png');      }  .gwtCellImage button:hover{        background-image:url('/images/icon/deleteRed.png');   }      .gwtCellImage button, .gwtCellImage button:hover{      width:16px;      height:16px;      background-size:contain;      background-position:center;      background-repeat:no-repeat;  }  

The deleteColumn showed Image but when I mouse over it the image did not turn to Red?

So I think i did something wrong?

Can you show me how to fix it?

(Also: http://stackoverflow.com/questions/22694926/how-to-style-clickabletextcell-column-that-was-rendered-as-image-column-gwt)

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