Style a WPF Button on right mouse click

Question

Is it possible to add a style trigger in WPF to a Button to determine whether or not the ContextMenu has opened?

If so, I'd like to color the background of the corresponding button if the contextmenu is opened.

Can't find a regular way to do it...

Answer 1

Here's a solution:

<Grid ShowGridLines="True">
 <Grid.RowDefinitions>
  <RowDefinition Height="Auto" />
 </Grid.RowDefinitions>
 <Button Grid.Column="1" Margin="5" Content="Button" x:Name="theButton">
  <Button.Background>
   <SolidColorBrush x:Name="BackgroundBrush" Color="LightGray" />
  </Button.Background>
  <Button.ContextMenu>
   <ContextMenu x:Name="contextMenu">
    <MenuItem Header="Option 1" />
    <MenuItem Header="Option 2" />
   </ContextMenu>
  </Button.ContextMenu>
  <Button.Triggers>
   <!-- This changed the color to red when the context menu is openning -->
   <EventTrigger RoutedEvent="Button.ContextMenuOpening">
    <BeginStoryboard>
     <Storyboard>
      <ColorAnimation Storyboard.TargetName="BackgroundBrush"
          Storyboard.TargetProperty="Color" Duration="0:0:0" To="Red" />
     </Storyboard>
    </BeginStoryboard>
   </EventTrigger>
   <!-- This changed the color back to light gray when the context menu is closing -->
   <EventTrigger RoutedEvent="Button.ContextMenuClosing">
    <BeginStoryboard>
     <Storyboard>
      <ColorAnimation Storyboard.TargetName="BackgroundBrush"
          Storyboard.TargetProperty="Color" Duration="0:0:0" To="LightGray" />
     </Storyboard>
    </BeginStoryboard>
   </EventTrigger>
  </Button.Triggers>
 </Button>
</Grid>