I do not get error in JS. Not in this case: void onInplaceUpdateFromGrid(String zone){ ajaxResponseRenderer.addCallback(new JavaScriptCallback() {
public void run(JavaScriptSupport javascriptSupport) { javascriptSupport.addInitializerCall("updateGrid",""); } }); } neither in this case: void onInplaceUpdateFromGrid(String zone) { javascriptSupport.addScript("Tapestry.Initializer.updateGrid()"); } update zone AJAX response do not have call of this functions. Grid handle this event in onInplaceUpdate method with way that i don't undestand. It use ComponentEventResultProcessor object for this. Thanks.