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我正在使用GXT3.1.2/GWT2.6 我想将复选框添加到TreeGrid中，但效果不佳。 当我点击复选框时，该行中的所有值都变为“true”。 而当我再次点击时，它会引发异常。请帮忙。GXT：如何将复选框添加到TreeGrid中？
这里是我的代码：
ColumnConfig<OBTInputTuple, Boolean> cc3 = new ColumnConfig<OBTInputTuple, Boolean>(new ValueProvider<OBTInputTuple, Boolean>(){
@Override
public Boolean getValue(OBTInputTuple object) {
return object.isMandatory();
}
@Override
public void setValue(OBTInputTuple object, Boolean value) {
object.setMandatory(value);
}
@Override
public String getPath() {
return null;
}
});
cc3.setCell(new CheckBoxCell());
cc3.setWidth(200);
cc3.setHeader("Mandatory");
当我点击一次复选框： 
当我再次点击复选框：
com.google.gwt.event.shared.UmbrellaException: Exception caught: Item was not already in the store, cannot be updated
at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)
at com.sencha.gxt.data.shared.Store.fireEvent(Store.java:610)
at com.sencha.gxt.data.shared.Store$Record.addChange(Store.java:174)
at com.sencha.gxt.widget.core.client.grid.Grid$2.update(Grid.java:878)
at com.sencha.gxt.cell.core.client.form.CheckBoxCell.onBrowserEvent(CheckBoxCell.java:171)
at com.sencha.gxt.cell.core.client.form.CheckBoxCell.onBrowserEvent(CheckBoxCell.java:1)
at com.sencha.gxt.widget.core.client.grid.Grid.fireEventToCell(Grid.java:875)
at com.sencha.gxt.widget.core.client.grid.Grid.handleEventForCell(Grid.java:907)
at com.sencha.gxt.widget.core.client.grid.Grid.onBrowserEvent(Grid.java:594)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1467)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1406)
at com.google.gwt.user.client.impl.DOMImplStandard.dispatchEvent(DOMImplStandard.java:323)
at sun.reflect.GeneratedMethodAccessor144.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.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)
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:347)
at sun.reflect.GeneratedMethodAccessor140.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:293)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.AssertionError: Item was not already in the store, cannot be updated
at com.sencha.gxt.data.shared.ListStore.update(ListStore.java:370)
at com.sencha.gxt.widget.core.client.treegrid.TreeGrid.onRecordChange(TreeGrid.java:1030)
at com.sencha.gxt.widget.core.client.treegrid.TreeGrid$1.onRecordChange(TreeGrid.java:253)
at com.sencha.gxt.data.shared.event.StoreRecordChangeEvent.dispatch(StoreRecordChangeEvent.java:113)
at com.sencha.gxt.data.shared.event.StoreRecordChangeEvent.dispatch(StoreRecordChangeEvent.java:1)
at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)
at com.sencha.gxt.data.shared.Store.fireEvent(Store.java:610)
at com.sencha.gxt.data.shared.Store$Record.addChange(Store.java:174)
at com.sencha.gxt.widget.core.client.grid.Grid$2.update(Grid.java:878)
at com.sencha.gxt.cell.core.client.form.CheckBoxCell.onBrowserEvent(CheckBoxCell.java:171)
at com.sencha.gxt.cell.core.client.form.CheckBoxCell.onBrowserEvent(CheckBoxCell.java:1)
at com.sencha.gxt.widget.core.client.grid.Grid.fireEventToCell(Grid.java:875)
at com.sencha.gxt.widget.core.client.grid.Grid.handleEventForCell(Grid.java:907)
at com.sencha.gxt.widget.core.client.grid.Grid.onBrowserEvent(Grid.java:594)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1467)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1406)
at com.google.gwt.user.client.impl.DOMImplStandard.dispatchEvent(DOMImplStandard.java:323)
at sun.reflect.GeneratedMethodAccessor144.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.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)
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:347)
at sun.reflect.GeneratedMethodAccessor140.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:293)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Unknown Source)