In found a way to do it, but my IFrame won't load the page. The frame doesn't even load
www.ext.net at first. Here's the code:
<ext:ToolbarButton IconCls="icon-picture16" ID="oToolbarButtonTakePictureCard" runat="server" Text="Foto nemen">
<AjaxEvents>
<Click OnEvent="TakePictureCardClick">
<ExtraParams>
<ext:Parameter Name="SchoolYear" Value="#{oGridPanelCards}.getSelectionModel().getSelected().data.SchoolYear" Mode="Raw" />
<ext:Parameter Name="StudentNumber" Value="#{oGridPanelCards}.getSelectionModel().getSelected().data.StudentNumber" Mode="Raw" />
</ExtraParams>
</Click>
</AjaxEvents>
<Listeners>
<Click Handler="showWindow(#{oDesktopWindowTakePicture});" />
</Listeners>
<ToolTips>
<ext:ToolTip Html="Neem een foto voor deze kaart" ID="oToolTipTakePictureCard" runat="server" Title="Foto nemen" />
</ToolTips>
</ext:ToolbarButton>
...
<ext:DesktopWindow Collapsible="false" Draggable="false" Height="600" IconCls="icon-picture16" ID="oDesktopWindowTakePicture" Maximizable="false" Modal="true" Resizable="false" runat="server" Title="Kaarten - Foto nemen" Width="855">
<AutoLoad MaskMsg"Bezig met laden van fotostudio" Mode="IFrame" ShowMask="true" Url="http://www.ext.net" />
</ext:DesktopWindow>
'Set url (string)
sUrl = "../Control.aspx?random=" & sRandomNumber & "&schoolyear=" & sSchoolYear & "&studentnumber=" & sStudentNumber
'Set control (panel)
Me.oDesktopWindowTakePicture.AutoLoad.Url = sUrl
'Load content
Me.oDesktopWindowTakePicture.LoadContent()