WPF中PreviewMouseDownEvent的系统处理：TabItem的PreviewMouseDown 事件弹框
背景：
UI中有一个TabControl， 包含2个TabItem，，当切换到别的TabItem时可能弹框然后根据逻辑判断是否跳转过去。然后我就做了这样一个demo:
xaml:
<UserControl
xmlns=""
xmlns:x =""
xmlns:d =""
xmlns:mc =""
xmlns:i =""
xmlns:ic =""
xmlns:local ="clr-namespace:WpfApplication4"
mc:Ignorable ="d"
x:Class ="WpfApplication4.MainView"
d:DesignWidth ="640"
d:DesignHeight ="480" >
<Grid
x:Name ="LayoutRoot" >
<TabControl
x:Name ="tbcTest"
SelectionChanged="TabControl_SelectionChanged" >
<TabItem
x:Name ="tiItem1"
Header="TabItem1" >
<Grid
Background="#FFE5E5E5" >
<Button
Content="Button"
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