Added reinitialize method to listbox component.

Author: kevzlou7979

gwt-material/src/main/java/gwt/material/design/client/ui/MaterialListBox.java

@@ -162,6 +162,13 @@ protected native void initializeMaterial(Element element) /*-{
         $wnd.jQuery(element).material_select();
     }-*/;
 
+    /**
+     * Re initialize the material listbox component
+     */
+    public void reinitialize() {
+        initializeMaterial(getElement());
+    }
+
     /**
      * Sets whether this list allows multiple selections.
      *