More MessageBox buttons

WinForms already had more buttons available for their MessageBox and https://github.com/dotnet/winforms/pull/4746 adds more.

## Buttons

[`System.Windows.MessageBoxButton`](https://docs.microsoft.com/en-us/dotnet/api/system.windows.messageboxbutton?view=windowsdesktop-6.0#fields)
- OK
- OKCancel
- YesNo
- YesNoCancel

[`System.Windows.Forms.MessageBoxButtons`](https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.messageboxbuttons?view=windowsdesktop-6.0#fields)
- AbortRetryIgnore
- CancelTryContinue
- OK
- OKCancel
- RetryCancel
- YesNo
- YesNoCancel

## Results

[`System.Windows.MessageBoxResult`](https://docs.microsoft.com/en-us/dotnet/api/system.windows.messageboxresult?view=windowsdesktop-6.0#fields)
- Cancel
- No
- None
- OK
- Yes

[`System.Windows.Forms.DialogResult`](https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.dialogresult?view=windowsdesktop-6.0#fields)
- Abort
- Cancel
- Continue
- Ignore
- No
- None
- OK
- Retry
- TryAgain
- Yes

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More MessageBox buttons #5795

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Buttons

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Metadata

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Projects

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Development

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