The Window component is just a container. You can put any content in it (including a form with textboxes). The key thing is implementing the login feature in your Blazor app - once you have it running in a simple <div> that you show with a simple @if-block, you can do the same with the Window (but it's easier to show by binding its Visible parameter to the field, without the if-block). The articles from MSDN here and here can help you get started. If you create such a sample, feel free to open a pull request and post it in this repo, we award such contributions with Telerik points: https://github.com/telerik/blazor-ui.
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