I have the following code:

             <ext:Button ID="btnRefresh" runat="server"  Text="Odśwież" Icon="ArrowRefresh">
                            <Listeners>
                                <Click Handler="#{Store1}.reload();" />
                            </Listeners>
                        </ext:Button>
The GridPanel consists approximately of 200 records. The above hides them and doesn't reload. What's wrong here? Page refresh would also do the trick.
How can I achieve reload or refresh?