SilverLight Application_Using Label and Textbox

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Silverlight4

Hi all,

i have made a simple application in silverlight4 which includes one label and a textbox , button. when i press a button the text from the textbox should be displayed in label.

i have installed silverlight sdk and silverlight plugins for browser but when i run the aaplication each time it ask for the silverlight developer runtime even i have installed it already. May i know why is it so? am i missing anything to install?

here is the app code...

<UserControl x:Class="First_App.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>

        </Grid.RowDefinitions>
        <TextBlock Name="txtname" Height="25" Width="75" HorizontalAlignment="Center"></TextBlock>
        <TextBox Name="txtbxname" Height="35" Width="90" HorizontalAlignment="Center" Margin="15" Grid.Row="2"></TextBox>
        <Button Name="mybtn" Content="ClickMe" Grid.Row="3" Width="55" Height="35" Click="mybtn_Click"></Button>
    </Grid>
</UserControl>

and in .cs file:

public partial class MainPage : UserControl
   {
       public MainPage()
       {
           InitializeComponent();
       }

       private void mybtn_Click(object sender, RoutedEventArgs e)
       {
           txtname.Text = txtbxname.Text;

       }
   }

Can anybody help me please???

thanks in advance.....