Checked and Unchecked are called at weird, unpredictable times by WPF, and saving settings when they happen causes us to change the setting incorrectly. OnClick is only called when the user actually changes the value and not when internal WPF stuff sets it, so it doesn't have this problem.
This is the SDK for StepManiaX platform development.
See the StepManiaX website and the documentation for info.
SDK support: sdk@stepmaniax.com
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