How to set MouseOver event/trigger for border in XAML?

I want the border to turn green when the mouse is over it and then to return to blue when the mouse is no longer over the border.

I attempted this without any luck:

<Border
Name="ClearButtonBorder"
Grid.Column="1"
CornerRadius="0,3,3,0"
Background="Blue">
<Border.Triggers>
<Trigger Property="Border.IsMouseOver" Value="True">
<Setter Property="Border.Background" Value="Green" />
</Trigger>
<Trigger Property="Border.IsMouseOver" Value="False">
<Setter Property="Border.Background" Value="Blue" />
</Trigger>
</Border.Triggers>
<TextBlock
HorizontalAlignment="Center"
VerticalAlignment="Center"
Text="X" />
</Border>

How can one set a trigger or events for MouseOver?

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最佳答案

Yes, this is confusing...

According to this blog post, it looks like this is an omission from WPF.

To make it work you need to use a style:

    <Border Name="ClearButtonBorder" Grid.Column="1" CornerRadius="0,3,3,0">
<Border.Style>
<Style>
<Setter Property="Border.Background" Value="Blue"/>
<Style.Triggers>
<Trigger Property="Border.IsMouseOver" Value="True">
<Setter Property="Border.Background" Value="Green" />
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
<TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="X" />
</Border>

I guess this problem isn't that common as most people tend to factor out this sort of thing into a style, so it can be used on multiple controls.