WPF DataTomplate中Command无效

问题：在DataTomplate中添加一个Button，Button添加Command，但是Command生效。

原因：ItemTemplate的DataContext指代不明，需要改为父类的DataContext。

解决方法：使用RelativeSource关键字，手动指定DataComtext和Command。

<userControl:AutoHideTabControl.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Title}" Margin="5,0,0,0" >
                                <i:Interaction.Triggers>
                                    <i:EventTrigger EventName="MouseLeftButtonDown">
                                        <i:InvokeCommandAction 
                                            Command="{Binding Path=DataContext.TabItemClickCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=userControl:AutoHideTabControl}}"
                                            CommandParameter="{Binding RelativeSource={x:Static RelativeSource.TemplatedParent}}"></i:InvokeCommandAction>
                                    </i:EventTrigger></i:Interaction.Triggers>
                            </TextBlock>                            
                            <!-- CommandParameter, 将父类作为参数传给后台命令 -->
                            <Button Content="Test" Command="{Binding Path=DataContext.(viewModels:CaseViewModel.TabItemClickCommand), RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=userControl:AutoHideTabControl}}"CommandParameter="{Binding RelativeSource={x:Static RelativeSource.TemplatedParent}}"></i:InvokeCommandAction>>
                        </StackPanel>
                    </DataTemplate>
                </userControl:AutoHideTabControl.ItemTemplate>

对应后台代码：

// ViewModel构造函数
public Constructors()
{
    TabItemClickCommand = new DelegateCommand<object>(TabItemClick);
}

//命令声明
public DelegateCommand<object> TabItemClickCommand{get; private set;} 

//命令实现
public void TabItemClick(object obj)
{
    var control = obj as ContentPresenter;
}

参考：WPF ListBoxItem DataTempldate command 执行问题