TextBox控件是一个比较特别的控件；

选中ListBoxItem中的TextBox后，如何改变ListBox的SelectedItem？这里写了一段简单的实例代码。

<ListBox x:Name="ImageListBox" >
	<ListBox.ItemsPanel>
		<ItemsPanelTemplate>
			<WrapPanel Orientation="Horizontal"/>
		</ItemsPanelTemplate>
	</ListBox.ItemsPanel>
	<ListBox.ItemTemplate>
		<DataTemplate>
			<Border x:Name="bd" >
				<TextBox  Width="150" Height="45" BorderBrush="Transparent" Background="Transparent"/>
			</Border>
		</DataTemplate>
	</ListBox.ItemTemplate>
	<ListBox.ItemContainerStyle>
		<Style TargetType="{x:Type ListBoxItem}">
			<Setter Property="Template">
				<Setter.Value>
					<ControlTemplate TargetType="{x:Type ListBoxItem}">
						<Border Background="{Binding Background,RelativeSource={RelativeSource AncestorType={x:Type ListBox}}}">
							<ContentPresenter />
						</Border>
					</ControlTemplate>
				</Setter.Value>
			</Setter>
		</Style>
	</ListBox.ItemContainerStyle>
</ListBox>

这里可以看出，选中了TextBox控件，但是listbox的SelectedItem并未发生改变；

解决办法：采用属性方法

<ListBox.ItemContainerStyle>
		<Style TargetType="{x:Type ListBoxItem}">
			<Setter Property="Template">
				<Setter.Value>
					<ControlTemplate TargetType="{x:Type ListBoxItem}">
						<Border Background="{Binding Background,RelativeSource={RelativeSource AncestorType={x:Type ListBox}}}">
							<ContentPresenter />
						</Border>
					</ControlTemplate>
				</Setter.Value>
			</Setter>
			<Style.Triggers>
				<Trigger Property="IsKeyboardFocusWithin" Value="true">
					<Setter Property="IsSelected" Value="true" />
				</Trigger>
			</Style.Triggers>
		</Style>
	</ListBox.ItemContainerStyle>