XAML (.XETO) IntelliSense not working specifically for `<Button>` element (other controls working)

[luxzz]

Description

XAML IntelliSense works normally for most Eto.Forms controls (e.g., Label, TextBox, StackLayout, GridLayout), but does not trigger at all for the <Button> element.

When typing:

<Button

no auto-complete suggestions appear.
However, autocomplete works for other controls inside the same XAML file.

This issue happens even when using a minimal file with a correct namespace, such as:

<Form xmlns="http://schema.picoe.ca/eto.forms"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Button Text="Test" />
</Form>

Other elements show IntelliSense, but <Button> does not.

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Steps to Reproduce

1. Create a new Eto.Forms project with XAML support.
2. Install Eto.Serialization.Xaml.
3. Add a simple XAML file with standard Eto namespaces.
4. Type <Button inside the Form.
5. Observe that IntelliSense does not show any suggestions.

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Expected Behavior

IntelliSense should display available attributes and properties for <Button> — just like other controls.

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Actual Behavior

No IntelliSense popup appears for <Button> (but works for other controls like Label, TextBox, etc.).

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Additional Notes

• Clean/Rebuild does not fix the issue.
• Reopening the file or restarting the IDE does not help.
• The issue reproduces consistently in new empty projects.
• The problem seems isolated to the Button control only.

[cwensley]

Hey @luxzz, thanks for reporting the issue. What version of Visual Studio are you using?

[ktwrd]

@cwensley I can reproduce on VS2026 (18.0.2) with the latest version of the extension.

But the solution also crashes on launch when trying to re-open a .xeto file, but that's a separate issue.

[luxzz]

@cwensley I'm on VS 2022 and VS 2026, and I’m getting the same issue in both.