Visual way to add DATATRIGGER in Expression Blend 2013
blend, datatrigger, expression-blend, wpf, xaml
Solution
Here is an example of how you'd do it using the GUI.
Consider this Window:
The goal in my example is to make the `Stroke` of the `Rectangle` blue when the `Checkbox.IsChecked` property changes to `True`.
For that first we have to add a `ChangePropertyAction` from `Assets` > `Behaviors`.
Drag and drop it onto a window/template/whatever. I put it into the window:
Now if you select it you can specify the `Trigger` in `Properties`.
I set the `TriggerType` to `DataTrigger`, the `Binding` to `Checkbox.IsChecked` and the required value for the `Trigger` to `True`.
Next, I specify the `Value` that should be changed when the `Trigger` fires.
I set the `Target` to the `Rectangle`, specified `Stroke` as `PropertyName` and set the `Value` this property should get when the `Trigger` fires to blue.
If I now start the application this is the result when I check the `CheckBox`:
Problem
Which is the right procedure to attach a datatrigger to an UI element using expression blend 2013? If I write datatrigger directly in xaml it works good, but I want to know if is there a "visual way" to do that. For example, creating a listboxitem style I'm doing something like this: ``` <DataTemplate x:Key="BoundingBoxTemplate" DataType="{x:Type is:BoundingBoxViewModel}" > <DataTemplate.Triggers> <DataTrigger Binding="{Binding IsBorderVisible}" Value="True"> <Setter TargetName="InsideRectangle" Property="Stroke" Value="Blue" /> </DataTrigger> </DataTemplate.Triggers> <Grid> <Rectangle x:Name="InsideRectangle" Width="{Binding Width}" Height="{Binding Height}" Fill="Black" SnapsToDevicePixels="True" /> </Grid> </DataTemplate> ``` Thank you Lorenzo