Storyboard in DataTemplate - wpf

Question

I have a ToggleButton that open a popup, and have a ItemsControl in Popup.
I want to hide popup when click on items in items control.
<ToggleButton Content="?????" x:Name="LeaveButton" Style="{StaticResource ToggleButtonImageStyle}" Padding="13"/>
<Popup
KeyDown="UIElement_OnKeyDown"
Opened="SubMenuPopup_OnOpened"
IsOpen="{Binding IsChecked, ElementName=LeaveButton}"
StaysOpen="False"
x:Name="LeavePopup"
AllowsTransparency="True"
PopupAnimation="Fade"
PlacementTarget="{Binding ElementName=LeaveButton}"
Placement="Right">
<StackPanel Orientation="Horizontal" Margin="15">
<Polygon Points="15 15,0 30,15 45" Fill="{DynamicResource HeaderBackgroundBrush}" />
<StackPanel Width="250">
<ItemsControl ItemsSource="{Binding WorkshopList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Button
Content="{Binding Name}"
Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.LeaveCommand}"
CommandParameter="{Binding Id}"
Style="{StaticResource ButtonImageTextStyle}"
Padding="20">
<Button.Triggers>
<EventTrigger RoutedEvent="ButtonBase.Click">
<BeginStoryboard Storyboard="{StaticResource HideLeavePopup}" />
</EventTrigger>
</Button.Triggers>
</Button>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</StackPanel>
</Popup>
and set a story for this.
<Storyboard x:Key="HideLeavePopup" Storyboard.TargetName="LeaveButton" Storyboard.TargetProperty="IsOpen">
<BooleanAnimationUsingKeyFrames>
<DiscreteBooleanKeyFrame KeyTime="00:00:00.1" Value="False" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
but when I use this, I get following error
LeaveButton name can not be found in the name scope of type 'System.Windows.Control.Button'

Answer 1

Did you try this?
Inside of your storyboard, Instead of
Storyboard.TargetName="LeaveButton"
use
Storyboard.Target="{Binding ElementName=LeaveButton}"

Answer 2

It depends where Storyboard is defined so I'll assume it's in Window.Resources or something alike. You use TargetName as LeaveButton and TargetProperty as IsOpen. You want either LeaveButton and IsChecked or LeavePopup and IsOpen. Also try changing TargetName to Target and use binding:
<Storyboard x:Key="HideLeavePopup"
Storyboard.Target="{Binding ElementName=LeaveButton}"
Storyboard.TargetProperty="IsChecked">
<BooleanAnimationUsingKeyFrames>
<DiscreteBooleanKeyFrame KeyTime="00:00:00.1" Value="False" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>