Problem to use Windows Phone's DatePicker control.

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C#

phone

Hi,
I have Windows 7 Ultimate, Visual Studio 2010 Ultimate. I have desire to develop a Windows Phone App with "DatePicker Control" into it.

First of all, I downloaded the “Windows Phone 7 toolkit” from the “Codeplex” website, and I added a namespace on .xaml as follow;

xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit".

So, to use DatePicker control, I coded it as follow on .xaml.

<toolkit:DatePicker HorizontalAlignment="Left" Margin="149,219,0,0" Name="txtStartOn" VerticalAlignment="Top" Width="325" Height="55" FontFamily="Verdana" FontSize="13.333" Foreground="#FFDA4D4D" />;

In the MainPage also I added; using Microsoft.Phone.Controls.Toolkit;

But it gives me an error as follow;
The type or Namespace name “Toolkit” does not exist in the Namespace “Microsoft.Phone.Control” (Are you missing an assembly reference?)

After that, manually I loaded “Microsoft.Phone.Controls.Toolkit.dll” from “Add Reference Window” into my Solution Project to fix the error and I can see “Microsoft.Phone.Controls.Toolkit” in my references list, but still I get the same error.

Do you have any idea?

Thanks in advance