Focusing Listbox item when a control is clicked inside datatemplate - wpf

Question

I have a button and on click of button a popup opens up which has a listbox. The items inside the listbox is templated and the template contains a date picker and 2 textboxes to enter date, the hour and minute.
The issue I'm facing with this is this - what ever I do on my datepicker or textboxes, the listbox item does't get focus unless I somehow explicitly click on the spaces btw the controls. Question is-how do i set the listbox item to be the selected item when any of the controls inside the datatemplate is clicked/focused? Please note that I follow MVVM.
Code:
ListBox:
<ListBox x:Name="AsOfList" SelectedItem="{Binding SelectedAsOfDate}" ItemsSource="{Binding Path=AsOfDates}"/>
DataTemplate:
<DataTemplate DataType="{x:Type Domain:UserDefinedDate}">
<DatePicker DockPanel.Dock="Left" Name="AsOfDate" Width="115" SelectedDate="{Binding SelectedDate,
UpdateSourceTrigger=PropertyChanged}" SelectedDateFormat="Short" FirstDayOfWeek="Monday" />
</DataTemplate>
Button:
<Button Grid.Row="1" Grid.Column="1" Height="25" HorizontalAlignment="Center" VerticalAlignment="Center" Name="SelectedDate" Click="SelectedDate_Click"
ToolTip="{Binding Path=AsOfDateViewModel.ToolTip}">
<Button.Content>
<DockPanel>
<TextBlock Text="{Binding Path=AsOfDateViewModel.DisplayText}" />
<Image Height="10" Width="10" Source="Down.png" />
</DockPanel>
</Button.Content>
</Button>
Popup:
<Popup x:Name="DateSelectorPopUp" PlacementTarget="{Binding ElementName=SelectedDate}" StaysOpen="False"
IsOpen="{Binding Path=AsOfDateViewModel.IsOpen}" >
<Views:AsOfDateSelector Width="Auto" DataContext="{Binding Path=AsOfDateViewModel}"/>
</Popup>

Answer 1

You can start BooleanAnimationUsingKeyFrames animation to set IsSelected when GotKeyboardFocus is triggered on ListBoxItem:
<ListBox x:Name="AsOfList" SelectedItem="{Binding SelectedAsOfDate}" ItemsSource="{Binding Path=AsOfDates}">
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Style.Triggers>
<EventTrigger RoutedEvent="GotKeyboardFocus">
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="IsSelected">
<DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
</ListBox.ItemTemplate>
</ListBox>