You will also need to set the URI mapper for each frame. In main page:

<Intersoft:UXFrame.UriMapper>
    <Intersoft:UriMapper>
        <Intersoft:UriMapping Uri="~" MappedUri="/PageRoot.xaml"/>
        <Intersoft:UriMapping Uri="/{Page}" MappedUri="/Module/{Page}.xaml"/>
    </Intersoft:UriMapper>
</Intersoft:UXFrame.UriMapper>

In Module page:

<Intersoft:UXFrame.UriMapper>
    <Intersoft:UriMapper>
        <Intersoft:UriMapping Uri="/Section/{Page}" MappedUri="/Module/Section/UXModule{Page}.xaml"/>
    </Intersoft:UriMapper>
</Intersoft:UXFrame.UriMapper>

The section page will be similar with the module page.

The browser URL will only follow the main frame navigation, when navigating to the Module or Section page. For example, the browser URL will still show http://localhost:5620/ClientUIApplication1TestPage.aspx#/UXPage1 even if we already navigate to the Section and Item page

@Jeejee

For the snippet to work, you will need to use DataPresenterTextColumn and disable the Presenter AutoGenerateColumns. Here is the modified snippet:

<Intersoft:GridPresenter x:Name="PresenterGrid1" Intersoft:DockPanel.Dock="Top" 
	 ItemsSource="{Binding AttachmentTypes}" SelectedItem="{Binding Path=SelectedItem, Mode=TwoWay}"
	 AutoGenerateColumn="No">
	<Intersoft:GridPresenter.Columns>
		<Intersoft:DataPresenterTextColumn Caption="Test" DataMemberField="AttachmentTypeName"/>
	</Intersoft:GridPresenter.Columns>
</Intersoft:GridPresenter>

@Balachander

I would like to note that without using RowTemplate, the Presenter now only work partially in MVVM scenario. Without RowTemplate, Presenter will only do initial binding once, that will mean in the Contacts sample after you edit the Contacts, the changes will not be reflected on the Presenter by default. 

A more integrated support for the presenter is planned for R2 release.

Do you mind providing us with the WebGrid setting you are using? We will need the WebGrid setting you are using in order to invetigate the issue further.

You could also try updating your WebGrid and Framework to the latest build, WebGrid 6 build 219 and WebUI Framework 3 build 753, if you have not using the latest build to check if the issue has been resolved in the latest build.

Re-attached the code.

The update panel compatibility is being fixed by the developer. The flypostbask is a workaround we provided for such scenario while the fix is being develop.

Based on my discussion with the developer, the function parameter currently only accept string and number. For your scenario, you could use number to determine if the value is true or false, 0 is false positive number is true. 

FunctionParameter boolVal1 = new FunctionParameter("1", "number"); //True
FunctionParameter boolVal2 = new FunctionParameter("0", "number"); //False

I am very sorry for the mark of answer issue. Unfortunately, the mark as answer can not be undone. I will update the mark as answer post to inform that this is still an ongoing discussion.

Unfortunately, our WebTextEditor could only save to or open HTML file for now.

Showing merged template document is achievable using a workaround, normally you will need to display the preview section in order to display the merge document. Here is the snippet, you will need to implement the Initialize client side event handler:

function WebTextEditor_OnInitialize(controlId)
{
    var WebTextEditor = ISGetObject(controlId);
    WebTextEditor.SwitchToPreview();

    setTimeout(function ()
    {
        var previewText = WebTextEditor.GetPreviewIFrameElement().contentWindow.document.body.innerHTML;

        WebTextEditor.SwitchToDesignView();
        WebTextEditor.SetValue(previewText);

        WebTextEditor.GetPreviewTabElement().style.display = "none";
               
        var hiddenToolBar = ["cmdInsertLabel", "cmdPreview", "cmdSendMail", "cmdSeparator4", "cmdSeparator5"];

        for (var i = 0; i < hiddenToolBar.length; i++)
        {
            var toolbarElem = document.getElementById(WebTextEditor.ToolBar[1].Name + "_" + hiddenToolBar[i]);
            toolbarElem.style.display = "none";
        }
    }, 150);
}

The snippet will move the preview text from the preview to design view. Afterward it will hide the mail merge toolbar and preview tab. I am using the MailMerge_CustomCollection provided sample in order to test my snippet