What executes commands after the wpf image is displayed? - continued

You are not using the ContentRendered event. You are using the Loaded event. The event handler (here) of the Loaded event is called Window_ContentRendered. Use of the name Window_ContentRendered does not make it handle the ContentRendered event.

You have changed the name of the event handler from Window_Loaded to Window_ContentRendered but not the event handled.

In WPF, the Window_ContentRendered event occurs after the window content has been rendered and is ready for display. By hooking up your commands to this event, you ensure they are executed at the appropriate time in the application lifecycle, specifically after the visual elements have been fully loaded and displayed.

Executing commands too early in the application lifecycle, such as in the Window_Loaded event, may result in them being executed before the visual elements are fully rendered, leading to unexpected behavior. Using Window_ContentRendered ensures that your commands are executed precisely when the window content is ready.

To use the Window_ContentRendered event, you need to hook up an event handler method to it. This can be done either in XAML or in code-behind. Here's an example of how to do it in code-behind:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        this.ContentRendered += MainWindow_ContentRendered; // Hook up the event handler
    }

    private void MainWindow_ContentRendered(object sender, EventArgs e)
    {
        // Execute your commands here
        ShowDialog();
        FillListBoxes();
    }
}