FormEnableDisableSample crashes in development mode with SmartGWT 3.0

[AloneAgainOr]

The problem is resolved, thank you.

[Isomorphic]

This issue should now be resolved

[AloneAgainOr]

It seems as if ClickHandlers on ButtonItem would crash with SmartGWT 3.0 when running in development mode:
Uncaught exception escaped: java.lang.ClassCastException
null

It can easily be reproduced with the FormEnableDisableSample.
If the ClickHandler is removed, there is no exception (but of course also no action :-(

I started migrating a bigger project from 2.5 to 3.0. I saw that exception, read about upgrade problems, and so I created a new project on a new PC that never saw any other SmartGWT version before. I ended up trying various samples from the ShowCase. The examples with DynamicForm and IButtons do not crash.

So far I have not found a workaround besides replacing the ButtonItems with IButtons - which does not work too well with my form layout.

I will have no internet access for the next week, so I cannot answer any questions before April, 10th.

1. SmartClient Version: v8.2p_2012-03-29/LGPL Development Only (built 2012-03-29)

2. IE 9.0.8112.16421 (but also 8.0.7601.17514)

5.
09:56:24.015 [ERROR] [riacsc] Uncaught exception escaped

java.lang.ClassCastException: null
at java.lang.Class.cast(Unknown Source)
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:163)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:57)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)

6. FormEnableDisableSample from the SmartGTW ShowCase