Controls in datatemplate not receiving input interaction - wpf

Question

I have a DataTemplate for a class as follows:
<DataTemplate DataType="{x:Type model:CalendarEvent}">
<Border BorderBrush="Black"
BorderThickness="1">
<Grid Margin="10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<TextBox Width="80"
Margin="0 0 20 0"
HorizontalAlignment="Right" />
<TextBlock Grid.Row="0"
FontSize="36"
Text="{Binding EventName}" />
<TextBlock Grid.Row="1">
<Run Text="From " /><Run Text="{Binding EventStartDate}" />
<Run Text=" till " /><Run Text="{Binding EventEndDate}" /></TextBlock>
</Grid>
</Border>
</DataTemplate>
After using the template as an ItemTemplate of an ItemsControl, I can't interact with the controls in it. When I try to click on any of the controls (since it is an item in a list), the whole ItemsControl is focused. In fact, I put the TextBox there to verfiy that the template is not receiving interactions. My original template has a Button (which was not receiving any Click event, either).
I should point out that the template is part of a plugin in a MEF application. Could that be the reason? In the host project, controls in a DataTemplate are working.
EDIT
<DataTemplate DataType="{x:Type model:CalendarEvent}">
<Border BorderBrush="Black"
BorderThickness="1">
<Grid Margin="10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock Grid.Row="0"
FontSize="36"
Text="{Binding EventName}" />
<TextBlock Grid.Row="1">
<Run Text="From " /><Run Text="{Binding EventStartDate}" />
<Run Text=" till " /><Run Text="{Binding EventEndDate}" /></TextBlock>
<TextBox Width="80"
Margin="0 0 20 0"
HorizontalAlignment="Right" />
</Grid>
</Border>
</DataTemplate>
Moving the TextBox below the TextBlocks did it. It was obscured by them since they are automatically filling the width of the Grid.
I could also have set fixed widths for the TextBlocks.