This is for a TextBox control on a login screen, where the TextBox contains

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Asked: June 4, 20262026-06-04T07:12:24+00:00 2026-06-04T07:12:24+00:00

This is for a TextBox control on a login screen, where the TextBox contains

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This is for a TextBox control on a login screen, where the TextBox contains the username. I want the TextBox to perform in the following way:

When the content is empty the content should be set to “Username”.
When the TextBox is clicked I want the content to be set to
“” i.e; nothing (unless the content has already been edited by the user).

This is a pretty standard feature nowadays, something like this wordpress login (at the top of page). coudn’t think of a better example than this I’m afraid 🙂

So, anyway, I’ve already done this using a ViewModel and it works well, but I’d like to know if this can be done purely from the XAML end. No business logic is concerned so I think it would be better to do it without the VM.