Newbie silverlight question: Passing parameter to usercontrol

let's say i have the following usercontrol :

<UserControl x:Class="TVPage.SilverlightControl1"
    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-compatibilit开发者_如何学Goy/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <TextBox Name="myTxt" Margin="125,107,115,147" />
    </Grid>
</UserControl>

I'd like to show this usercontrol inside of a telerik radWindow by setting the mytxt text from another form. I just start the silverlight, and trying to understand the basic and would appreciate any helps.

You will need to pass the value you want in the text box in to the constructor of the user control when you create it on the main window.