Silverlight 焦点疑云

焦点，还是焦点。silverlight 在不同的Style下，竟然失去了焦点，所以，当你的界面，子窗口突然没了焦点，可以去查一查你的Style做了哪些改动。

在作一个ChildWindow的显示时，以前使用的Style是可以在子窗口内获得键盘输入，但是为了某个效果，复制了一个stlye，去掉了一些动画效果，

结果回来发现，键盘输入功能失效了，所有的键盘事件都不响应了。

                                <VisualState x:Name="Open">
                                    <Storyboard>
                                        <DoubleAnimationUsingKeyFrames BeginTime="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Overlay">
                                            <EasingDoubleKeyFrame KeyTime="0" Value="0"/>
                                            <EasingDoubleKeyFrame KeyTime="00:00:00.3" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames BeginTime="0" Storyboard.TargetProperty="(RenderTransform).(Children)[0].ScaleX" Storyboard.TargetName="ContentRoot">
                                            <SplineDoubleKeyFrame KeyTime="0" Value="0"/>
                                            <SplineDoubleKeyFrame KeyTime="00:00:00.25" Value="0"/>
                                            <SplineDoubleKeyFrame KeyTime="00:00:00.4" Value="1"/>
                                            <SplineDoubleKeyFrame KeySpline="0,0,0.5,1" KeyTime="00:00:00.45" Value="1.05"/>
                                            <SplineDoubleKeyFrame KeyTime="00:00:00.55" Value="1"/-->
                                        </DoubleAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames BeginTime="0" Storyboard.TargetProperty="(RenderTransform).(Children)[0].ScaleY" Storyboard.TargetName="ContentRoot">
                                            <SplineDoubleKeyFrame KeyTime="0" Value="0"/>
                                            <SplineDoubleKeyFrame KeyTime="00:00:00.25" Value="0"/>
                                            <SplineDoubleKeyFrame KeyTime="00:00:00.4" Value="1"/>
                                            <!--SplineDoubleKeyFrame KeySpline="0,0,0.5,1" KeyTime="00:00:00.45" Value="1.05"/>
                                            <SplineDoubleKeyFrame KeyTime="00:00:00.55" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>

当时就想，要是有一个焦点的跟踪列表就好了。但是好像从古至今，没有这个东西啊。

焦点问题在silverlight中这是一个比较困惑的问题。

比如，控件的KeyUp，KeyDown事件，应该截获所有的键盘，但是偏偏缺省按钮的事件不能截获。