It seems that there is a bug corresponding to the button iconStyle in gxt2.0

Example:
css :
Code:
.toDashBoard {width: 16px; height:  16px; background-image: url(icons/toDashBoard16.png)}
code :
Code:
Button exportToDashBoardTool = new Button();	
exportToDashBoardTool.setIconStyle("toDashBoard");
exportToDashBoardTool.setMenu(menu);
MenuItem menuItem = new MenuItem("New");  
menuItem.setIconStyle("toDashBoard");   
menu.add(menuItem);
The icon is shown on the menuItem but not on the button.

Thanks for your attention