[FIXED] [#1594] [4.7.0] Clear value in a GridPanel Column Filter

[opendat2000]

Hello, I'm trying to clear a filter text when the user disable it, but it's not working
it is possible to do this?

<Activate Handler="alert('Hello World');" /> is also not working, maybe i'm using the deactivate and activate listeners in a wrong way

                            <ext:Column runat="server" Text="Usuario" DataIndex="NOMBRE_CONCATENADO" Width="200">
                                <Filter>
                                    <ext:StringFilter EmptyText ="Ingrese Criterio Filtro" DataIndex="NOMBRE_CONCATENADO" > 
                                        <Listeners>
                                            <Activate  Handler="alert('Hello World');" />
                                            <Deactivate Handler="this.setValue('');" />
                                        </Listeners>
                                    </ext:StringFilter>
                                </Filter>
                            </ext:Column>