How to target a different control with a trigger? - wpf

Question

How can I click the button and then it set the Value of txtNoOfVehicles to NULL or ""?
<dxg:GridControl ItemsSource="{Binding ShiftEntries}">
<dxg:GridControl.Columns>
<dxg:GridColumn Header="No. of Vehicles">
<dxg:GridColumn.CellTemplate>
<DataTemplate>
<StackPanel>
<dxe:TextEdit x:Name="txtNoOfVehicles" Text="{Binding RowData.Row.NoOfVehicles}" Mask="\d{1,4}" MaskType="RegEx" NullText="Infinity" NullValue="{x:Null}" AllowNullInput="True" ShowError="False" />
<Button Content="Infinity" Margin="3" />
</StackPanel>
</DataTemplate>
</dxg:GridColumn.CellTemplate>
</dxg:GridColumn>
</dxg:GridControl.Columns>
</dxg:GridControl>
I researched style/data/event triggers, but all the examples I saw targeted the same control that had the trigger applied. I would like the trigger on the click of the button, and the target to be the Text property of the TextEdit.
I Tried:
<Button Content="Infinity" Margin="3">
<Button.Style TargetType="{x:Type Button}">
<Style.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="txtNoOfVehicles" Property="dxe:TextEdit.Text" Value="{x:Null}" />
</Trigger>
</Style.Triggers>
</Button.Style>
</Button>

Answer 1

To answer your question you can do something like this
<StackPanel>
<TextBlock Name="Block" Text="Test" />
<Button Name="btn">
<Button.Triggers>
<EventTrigger SourceName="btn" RoutedEvent="Button.Click">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Block"
Storyboard.TargetProperty="Text"
>
<DiscreteObjectKeyFrame Value=""></DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</StackPanel>