Addin doesnt open window or messagebox

[hlingen]

Like in the title. My inventor addin doesnt open a window or messagebox and i cant figure out why.

My code is as follows:

public void Activate(ApplicationAddInSite addInSiteObject, bool firstTime)
{
    inventorApplication = addInSiteObject.Application;

    // Create a new RibbonTab
    RibbonTab ribbonTab = inventorApplication.UserInterfaceManager.Ribbons["Part"].RibbonTabs.Add("HorizonTab", "Horizon Tab", "a86e9d80-d720-4020-97b2-244323f99115");

    // Create a new RibbonPanel
    RibbonPanel ribbonPanel = ribbonTab.RibbonPanels.Add("HorizonPanel", "Horizon Panel", "a86e9d80-d720-4020-97b2-244323f99115");

    // Create a ButtonDefinition for opening a window
    ButtonDefinition openWindowButton = inventorApplication.CommandManager.ControlDefinitions.AddButtonDefinition(
        "OpenWindowButton",
        "Open Window",
        CommandTypesEnum.kEditMaskCmdType,
        "{yourClientId}",
        "Sample text for opening a window",
        "icon_open_window.ico"
    );

    // Create a ButtonDefinition for displaying a message box
    ButtonDefinition messageBoxButton = inventorApplication.CommandManager.ControlDefinitions.AddButtonDefinition(
        "MessageBoxButton",
        "Show Message",
        CommandTypesEnum.kEditMaskCmdType,
        "{yourClientId}",
        "Sample text for displaying a message box",
        "icon_message_box.ico"
    );

    // Register event handlers for button clicks
    openWindowButton.OnExecute += OpenWindowHandler;
    messageBoxButton.OnExecute += MessageBoxHandler;

    // Add the buttons to the ribbon panel
    ribbonPanel.CommandControls.AddButton(openWindowButton, false);
    ribbonPanel.CommandControls.AddButton(messageBoxButton, false);
}
private void OpenWindowHandler(NameValueMap context)
{
    // Debugging check
    System.Diagnostics.Debug.WriteLine("OpenWindowHandler called");

    // Implement the code to open a window here (using Windows Forms)
    Form window = new Form();
    window.Text = "Sample Window";
    window.Size = new System.Drawing.Size(400, 200);
    window.Controls.Add(new Label() { Text = "This is a sample window." });
    // Start a message loop for the window
    System.Windows.Forms.Application.Run(window);
    // window.ShowDialog();
}

private void MessageBoxHandler(NameValueMap context)
{
    // Debugging check
    System.Diagnostics.Debug.WriteLine("MessageBoxHandler called");

    // Display a message box with the sample text
    MessageBox.Show("Sample text for displaying a message box", "Message Box");
}

Can someone help me with this. Note, it is my first programming in C#. 

[JelteDeJong]

in the first lines of your activate method, you add a RibbonTap and a RibbonPanel. That can be an issue if they already exist. Therefore you should check if it already exists before you try to add them.

Also, I would suggest surrounding everything in the activate method in a try/catch block. so you know if something errored out. More info on that in my blog post: "Help: My addin won't load"

[hlingen]

Thanks for your answer, I will add a try catch block around the method. I made some progress though which creates more questions.

When i ran the code block as is in Debug mode, set breakpoints on the `button.onExecute` lines, it suddenly worked. 
Building the addin, and it doesnt anymore. Have you seen this before?