This is how I create buttons at runtime for a basic inventory system.

CreateButtons.cs

	public void InitializeOtherInventory()
	{
    // InventoryPage is a variable assigned through the Stride GameStudion of type UIPage
		var inventoryStack = InventoryPage.Page.RootElement.FindVisualChildOfType<ScrollViewer>("OtherItems")
			.FindVisualChildOfType<StackPanel>();
      
    // Clear the current list of buttons
		inventoryStack.Children.Clear();

    // Run GetInventoryButton and add it to the list of reach item
		foreach (var item in OtherInventory.Items)
		{
			string name = $"{item.Name} ({item.Quantity})";
			var button = GetInventoryButton(item.ItemPrefab, name, item.Quantity);
			inventoryStack.Children.Add(button);
		}

		_transferButton.IsEnabled = true;
		_transferButton.Visibility = Visibility.Visible;
	}

  // Creates a new button that is cloned from CustomButtons which is a unique UIElement from a UILibrary
	private Button GetInventoryButton(Prefab prefab, string text, int quantity, string description = "No description", ISpriteProvider image = null)
	{
		var element = CustomButtons.InstantiateElement<Button>("ImageTextButton");

		element.FindVisualChildOfType<Grid>().FindVisualChildOfType<TextBlock>().Text = text;

		if(image != null)
		{
			element.FindVisualChildOfType<Grid>().FindVisualChildOfType<ImageElement>().Source = image;
		}

		element.Height = 80;
		element.VerticalAlignment = VerticalAlignment.Top;

		// add the inventory item to a dictionary and conatin the dictionary key in the button
		element.Name = Guid.NewGuid().ToString();
		itemsAttachedToButtons.TryAdd(element.Name, prefab);

		element.Click += (s, e) => { OnButtonPress(text, description, quantity, image); };
		element.Click += ItemButton_Click;

		return element;
	}