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Editorial Team
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Asked: 2026-05-26T14:41:38+00:00

I’m using Silverlight with the MVVM. I have a simple LoginControl bound to a

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I’m using Silverlight with the MVVM.

I have a simple LoginControl bound to a LoginControlViewModel. The LoginControl is created and added to my MasterPage.

When the user logs in to my app, by pressing the Login BUtton on the LoginControl, the LoginControlViewModel sends an event back to the MasterPageControlViewModel. At this point the MasterPageControlViewModel.LoginVisible property is set to False.

The problem i am having is with XAML of the MasterPageView, since I dont know how to bind the LoginControl to the MasterPageControlViewModel.LoginVisible property. The below doesn’t work.

<Controls:Login x:Name="LoginControl" Style="{StaticResource LoginControlStyle}"
    Visibility="{Binding LoginControlVisibility, Converter={StaticResource BoolConverter}}" />

The output window states the following:

System.Windows.Data Error: BindingExpression path error: ‘LoginControlVisibility’ property not found on ‘Silverlight.Controls.LoginControlViewModel’ ‘Silverlight.Controls.LoginControlViewModel’ (HashCode=43749873). BindingExpression: Path=’LoginControlVisibility’ DataItem=’Silverlight.Controls.LoginControlViewModel’ (HashCode=43749873); target element is ‘Controls.Login’ (Name=’LoginControl’); target property is ‘Visibility’ (type ‘System.Windows.Visibility’)

Any idea how to resolve this?

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1 Answer

  1. Editorial Team

    Ah, and I see your property is on a different ViewModel than what the control has for it’s DataContext.

    What I’ve done in the past is place the LoginControl in another container (say a Border or StackPanel) and then you can bind the Visibility of that panel to your property. That way the DataContext of the LoginControl stays the LoginControlViewModel and the visibility binding is simple.

    Edit: Turns out below method is not supported in Silverlight.

    Or you can have a complicated binding on the LoginControl that looks at its parents DataContext:

    Visibility="{Binding Path=DataContext.LoginVisible, 
         RelativeSource={RelativeSource FindAncestor, AncestorType=MasterPage},
         Converter={StaticResource BoolConverter}}"

    Also isn’t your property called LoginVisible not LoginControlVisibility as you have in your binding? Or was that a typo just in the question?

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