Problem with Actipro control reference on .Net Framework 3.5

Hi,

I want to use some controls (EnumListBox, Barcode etc) on a .Net Framework 3.5 project, but everytime i add a control, it always throws an error of

Error 93 The tag 'EnumListBox' does not exist in XML namespace 'http://schemas.actiprosoftware.com/winfx/xaml/editors'. Line 26 Position 14. C:\Users\kramos\Documents\Visual Studio 2010\Projects\DIY\DIY.UITest\MainWindow.xaml 26 14 DIY.UITest

Note:

the (xmlns:my="clr-namespace:ActiproSoftware.Windows.Controls.Editors;assembly=ActiproSoftware.Editors.Wpf") is used and everytime  call the "my:" it shows all the available controls inside like EnumListBox, AnalogClock, Calculator etc.

i tried number of steps in order to reference actipro, but still it throws an error,

Thanks.