[Bug] PopupHandler is incompatible

Description

Showing a popup based on XAML leads to the error

CommunityToolkit.Maui.Core.Handlers.PopupHandler found for TestApp.ProfilePopup is incompatible

Steps to Reproduce

1. Create a new MAUI Application
2. Install CommunityToolkit
3. Create a Popup-XAML
4. Change the OnCounterClicked in Mainpage to show popup using this.ShowPopup(popup)

XAML:

<?xml version="1.0" encoding="utf-8" ?>
<toolkit:Popup xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
               xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
               xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
               x:Class="TestApp.ProfilePopup">

    <VerticalStackLayout>
        <Label Text="This is a very important message!" />
    </VerticalStackLayout>

</toolkit:Popup>

OnCounterClicked:

 private void OnCounterClicked(object sender, EventArgs e)
    {

        var popup = new ProfilePopup();

        this.ShowPopup(popup);

    }

Creating the popup in Code works as expected:

    private void OnCounterClicked(object sender, EventArgs e)
    {
        var popup = new Popup
        {
            Content = new VerticalStackLayout
            {
                Children =
        {
            new Label
            {
                Text = "This is a very important message!"
            }
        }
            }
        };

        this.ShowPopup(popup);

    }

[ToolmakerSteve]

The bug is in poster’s code, not in Toolkit Popup. I explain what was done wrong in my StackOverflow answer.

(There is no ProfilePopup.xaml.cs file, so no InitializeComponent call.)

[bijington]

@gironymo thanks for this feedback, we have assumed some initial knowledge around XAML files with our documentation specifically around this page: https://docs.microsoft.com/en-gb/dotnet/maui/xaml/fundamentals/get-started#anatomy-of-a-xaml-file

I appreciate that even the linked page doesn’t give a good insight to developers new to XAML.

We can look to add something else to improve our documentation pages though.