ToggleSwitch.IsChecked not change yet at CheckChangedCommand

Describe the bug When CheckChangedCommand called, the CheckChangedCommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=IsChecked}" is the old value.

To Reproduce

<controls:ToggleSwitch IsChecked="{Binding xxx}"
                       CheckChangedCommand="..."
                       CheckChangedCommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=IsChecked}" />

void ExecuteCheckChanged(bool? isChecked) {
    // isChecked is the old value, in other words it's false if checked and true if unchecked 
    // But CheckedCommand and UnCheckedCommand works as expected
}

Expected behavior it’s true if checked and false if unchecked.

Environment(please complete the following information):

• MahApps.Metro version [v1.6.5]
• OS: [Win10 1809]
• Visual Studio [2017 15.9.11]
• .NET Framework [4.6.2]

[AKruimink]

If this has been resolved, feel free to close the issue 👍

[GF-Huang]

You’re right, thanks.