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Editorial Team
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Asked: 2026-05-16T23:34:51+00:00

I have a ToggleButton with its IsChecked property bound to a property using a

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I have a ToggleButton with its IsChecked property bound to a property using a OneWay binding.

<ToggleButton
    Command="{Binding Path=SomeCommand}"
    IsChecked="{Binding Path=SomeProperty, Mode=OneWay}" />

The SomeCommand toggles the boolean SomeProperty value, and a PropertyChanged event is raised for SomeProperty.

If I change SomeProperty in my viewmodel the ToggleButton depresses correctly. However if I click the ToggleButton the binding seems to get lost and the button no longer gets checked according to the value of SomeProperty. Any ideas on how to fix this problem?

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1 Answer

  1. Editorial Team

    This is by design when using oneway data binding. Add the attached property PresentationTraceSources.TraceLevel=High to your binding and you will see when it gets disconnected. This link describes the problem as well (without offering any solution): Debugging Data Binding in WPF

    The way I normally solve it is to use a command for user interaction and code behind to change the control appearance because of some changed properties.

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