请问下命名空间的问题
<UserControl
x:Class="SilverlightTapHello1.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phoneNavigation="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Navigation"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="800"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}" Width="800" Height="480">
<Grid x:Name="LayoutRoot" Background="{StaticResource PhoneBackgroundBrush}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitleGrid is the name of the application and page title-->
<Grid x:Name="TitleGrid" Grid.Row="0">
<TextBlock Text="SILVERLIGHT TAP HELLO #1" x:Name="textBlockPageTitle" Style="{StaticResource PhoneTextPageTitle1Style}"/>
<TextBlock x:Name="textBlockListTitle" Style="{StaticResource PhoneTextPageTitle2Style}"/>
</Grid>
<!--ContentGrid is empty. Place new content here-->
<Grid x:Name="ContentGrid" Grid.Row="1" MouseLeftButtonDown="ContentGrid_MouseButtonDown" Background="{StaticResource PhoneBackgroundBrush}">
<TextBlock x:Name="TextBlock" Text="hello"
HorizontalAlignment="Center"
VerticalAlignment="Center"
/>
</Grid>
</Grid>
</UserControl>
请问下这段代码里面是不是key都是定义在红色显示的命名空间里的 如果我想添加新的key要怎么做啊 如果直接在代码里面使用其它key就会说无法识别呢