[CLOSED] Checkbox IndicatorIcon overlay problem

[xeo4.it]

Hi all,
with the upgrade from V4.4 to V4.5 a problem has occurred with some checkboxes inside <td/>.
If the <td/> is hidden before the page loads and get showed after, the checkbox's IndicatorIcon is rendered over the checkbox.

<div>
            <ext:ResourceManager runat="server" />
            <script>
                Ext.onReady(function () {
                    document.getElementById("tdCheckbox").style.display = 'block';
                });
            </script>
            <style>
                .hidden{
                    display: none;
                }
            </style>
            <ext:Panel runat="server" Height="100" ID="pnlMain">
                <Content>
                    <table>
                        <tr>
                            <td>
                                <ext:Checkbox runat="server" IndicatorIcon="Help" FieldLabel="Icon OK" ID="ckOk" />
                            </td>
                        </tr>    
                        <tr>
                            <td class="hidden" id="tdCheckbox">
                                <ext:Checkbox runat="server" IndicatorIcon="Help" FieldLabel="Icon KO" ID="ckKo" />
                            </td>
                        </tr>    
                    </table>
                </Content>
            </ext:Panel>
        </div>

Setting the checkbox width or calling updateLayout() get no effects.
Any ideas?
Thank you!