ie and firefox Not compatible

Hi All:

ie and firefox Not compatible!

pic 1 is ie
pic 2 is firefox

this demo is in the showcase demo
about tree

gwt 2.2+smartgwt 2.4

public class LocalDataTreeSample implements EntryPoint {   
  
    public void onModuleLoad() {   
        TreeGrid treeGrid = new TreeGrid();   
        treeGrid.setWidth(300);   
        treeGrid.setHeight(400);   
  
        TreeGridField field = new TreeGridField("Name", "Tree from local data");   
        field.setCanSort(false);   
  
        treeGrid.setFields(field);   
  
        final Tree tree = new Tree();   
        tree.setModelType(TreeModelType.PARENT);   
        tree.setNameProperty("Name");   
        tree.setIdField("EmployeeId");   
        tree.setParentIdField("ReportsTo");   
        tree.setShowRoot(true);   
  
        EmployeeTreeNode root = new EmployeeTreeNode("4", "1", "Charles Madigen");   
        EmployeeTreeNode node2 = new EmployeeTreeNode("188", "4", "Rogine Leger");   
        EmployeeTreeNode node3 = new EmployeeTreeNode("189", "4", "Gene Porter");   
        EmployeeTreeNode node4 = new EmployeeTreeNode("265", "189", "Olivier Doucet");   
        EmployeeTreeNode node5 = new EmployeeTreeNode("264", "189", "Cheryl Pearson");   
        tree.setData(new TreeNode[]{root, node2, node3, node4, node5});   
  
        treeGrid.addDrawHandler(new DrawHandler() {   
            public void onDraw(DrawEvent event) {   
                tree.openAll();   
            }   
        });   
           
        treeGrid.setData(tree);   
  
        treeGrid.draw();   
    }   
  
    public static class EmployeeTreeNode extends TreeNode {   
  
        public EmployeeTreeNode(String employeeId, String reportsTo, String name) {   
            setEmployeeId(employeeId);   
            setReportsTo(reportsTo);   
            setName(name);   
        }   
  
        public void setEmployeeId(String value) {   
            setAttribute("EmployeeId", value);   
        }   
  
        public void setReportsTo(String value) {   
            setAttribute("ReportsTo", value);   
        }   
  
        public void setName(String name) {   
            setAttribute("Name", name);   
        }   
    }   
  
}

You either have external CSS in your project (see FAQ) or you are using IE9 with 2.4 and the HTML5 docType, which is only supported with nightlies (SmartClient.com/builds).