如同一个Grid中的一个按钮根据另一个按钮的显示与否作出不同的响应:
绑定的时候通过ElementName来指定控件
<Grid Margin="50,130">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<Button Content="asdfasdfadsfa" Background="Aquamarine">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border x:Name="bd" BorderBrush="Black" Background="{TemplateBinding Background}" BorderThickness="1" CornerRadius="6,0,0,6" >
<TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" Text="{TemplateBinding Content}"/>
</Border>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding ElementName=btn2,Path=Visibility}" Value="Collapsed">
<Setter TargetName="bd" Property="CornerRadius" Value="6,6,6,6"/>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
</Button>
<Button x:Name="btn2" Grid.Column="2" Command="{Binding MainCommand}" Background="Beige">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border BorderBrush="Black" Background="{TemplateBinding Background}" BorderThickness="0,1,1,1" CornerRadius="0,6,6,0" >
<Path Data="M 0,0 L 20,0 L 10,10 Z" Fill="Black" VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
</Button>
</Grid>