How to change button background color depending on bound command canexecute? - xaml

Question

I Have a ItemTemplate in which is a simple button bound on a command, which can be executable or not depending on some property.
I'd like the color of this button's background to change if the command isn't executable.
I tried several methods, but I can't find anyway to do this purely in XAML (I'm doing this in a study context, and code behind isn't allowed).
Here's my code for the button :
<Button x:Name="Dispo" HorizontalAlignment="Center" Margin="0" VerticalAlignment="Center" Width="30" Height="30"
Grid.Column="2" Grid.Row="0"
Command="{Binding AddEmpruntCommandModel.Command}"
CommandParameter="{Binding ElementName='flowCars', Path='SelectedItem'}"
vm:CreateCommandBinding.Command="{Binding AddEmpruntCommandModel}" >
<Button.Style>
<Style TargetType="{x:Type Button}">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="True">
<Setter Property="Button.Background" Value="Green"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Button.Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>

Answer 1

You can specify your own template like that:
<Button Content="OK" Command="{Binding SomeCommand}">
<Button.Style>
<Style>
<Setter Property="Button.Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border x:Name="Border" Background="Green">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="Border" Property="Background" Value="Red" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
</Button>