diff --git a/zkwebui/WEB-INF/src/org/adempiere/webui/session/WebUIServlet.java b/zkwebui/WEB-INF/src/org/adempiere/webui/session/WebUIServlet.java
index c985029676..ffadf3baab 100644
--- a/zkwebui/WEB-INF/src/org/adempiere/webui/session/WebUIServlet.java
+++ b/zkwebui/WEB-INF/src/org/adempiere/webui/session/WebUIServlet.java
@@ -37,6 +37,7 @@ import org.compiere.util.CLogMgt;
 import org.compiere.util.CLogger;
 import org.compiere.util.Env;
 import org.compiere.util.Ini;
+import org.zkoss.lang.Library;
 import org.zkoss.zk.ui.http.DHtmlLayoutServlet;
 
 /**
@@ -65,6 +66,9 @@ public class WebUIServlet extends DHtmlLayoutServlet
         ServerContext.newInstance();
         Env.setContextProvider(new ZkContextProvider());
         
+        // Use ZK 3.0 theme, because ZK 3.5 theme is so buggy - teo_sarca
+        Library.setProperty("org.zkoss.zul.theme.v30", "true");
+        
         /**
          * Start ADempiere
          */