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Describe the bug

Page's Theme's parameter button_theme turns the entire window grey.
In flet doc Theme doesn't have parameter button_theme, but in code class Theme have button_theme.

Code sample

page.add(
    Card(
        Column(
            controls=[
                Text("Test"),
                ElevatedButton("TestButton")
            ]
        )
    )
)

To reproduce

1. run app with hot reload
2. set page.theme(or dark_theme) parameter Theme with parameter button_theme
3. so now app has only grey color without elements

Expected behavior

i want to set default theme for buttons on my app

Screenshots / Videos

Operating System

Windows

Operating system details

windows 10

Flet version

flet 0.25.2

Regression

I'm not sure / I don't know

Suggestions

This parameter has probably not been fully developed yet and perhaps this should be added in the comment, because it mislead

Logs

[Paste your logs here]

Additional details

No response