Developer forum

1) RibbonBar with dialog window

Here is a very basic example of how to implement a ribbon bar add-in with a button that opens a dialog...

using Dynamicweb.Controls;
using Dynamicweb.Controls.Extensibility;
using Dynamicweb.Extensibility.AddIns;
using Dynamicweb.Security.UserManagement;
 
namespace MyRibbonBars
{
    [AddInTarget(RibbonBarAddInTarget.UserManagement.UserEdit)]
    public class UserEditRibbonBar : RibbonBarAddIn
    {
        public UserEditRibbonBar(RibbonBar ribbon) : base(ribbon)
        {
        }
 
        public override void Load()
        {
            // Get the data from current context
            var user = Ribbon.DataContext.DataSource as User;
            if (user == null)
            {
                return;
            }
 
            // Add the dialog
            var dialog = new Dialog()
            {
                ID = "MyCustomDialog",
                Title = "Test Dialog"
            };
            
            AddWindow(dialog);
 
            // Add some content to the dialog
            var dialogContent = new System.Web.UI.HtmlControls.HtmlGenericControl("div")
            {
                InnerText = $"Hello! The username is: {user.UserName}"
            };
 
            dialog.Controls.Add(dialogContent);
            
            // Add a ribbon bar button for opening the dialog
            var group = Ribbon.CreateGroup("MyCustomTab", "MyCustomGroup");
 
            var button = new RibbonBarButton()
            {
                Text = "Test Button",
                OnClientClick = $"dialog.show('{dialog.ID}');"
            };
 
            group.AddItem(button);
        }
    }
}

2) Module implementation hasn't really changed.

In DW9 you can use module annotations, but it's just an alternative way of registering a module. You can find an example of that in the API documentation for ContentModule class.
 

You can add any content to the dialog by using controls. If you want do display content from a specific URL then you could either add an iframe control or include a script that loads content using ajax.

var dialogContent = new System.Web.UI.HtmlControls.HtmlIframe
{
    Src = "/custommodules/mymodule/somepage.aspx"
};
 
dialog.Controls.Add(dialogContent);

The HttpCompression module is not used in DW9. Looks like you are using an old web.config file. Always ensure that web.config is updated when you upgrade a solution.
Take a look at Installing Dynamicweb, Upgrading a custom solution and Extending - an introduction. You can also download the DW9 templates for Visual Studio and give them a try.

Best regards,
Morten