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I have a UserControl with a story board and I want to stop the animation when the control's Visibility changes. I created a Trigger to pause the animation and start it depending on the state, but I keep getting an ArgumentException. Here is the XAML: <UserControl.Triggers> <EventTrigger RoutedEvent="FrameworkElement.Loaded"> <BeginStoryboard x:Name="ProgressAnimation_BeginStoryboard" Storyboard="{StaticResource ProgressAnimation}"/> </EventTrigger> <Trigger Property="Control.Visibility" Value="Collapsed"> <PauseStoryboard BeginStoryboardName="ProgressAnimation_BeginStoryboard" /> </Trigger> <Trigger Property="Control.Visibility" Value="Visible"> <ResumeStoryboard BeginStoryboardName="ProgressAnimation_BeginStoryboard" /> </Trigger> </UserControl.Triggers> and here is the Exception: The value "System.Windows.Media.Animation.PauseStoryboard" is not of type "System.Windows.SetterBase" and cannot be used in this generic collection. Parameter name: value How would I do this in XAML ? Thanks, Raul

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