How Do I Add A New Wpf User Control To A Element Host In Winforms

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WPF

WinForms

how do i add a new wpf control into an element host. successfully added two first wpf controls i created into elementhost1 (usercontrol1) elementHost2 ( userControl2) Now any wpf user controls i add afterwards are not usable. getting the following error:

error setting value 'Project_Name.userControl3'to property 'Child'. Details could not load type 'Project_Name.userControl3'from assembly 'Project_Name, version 1.0.0.0, culture = neutural, PublicKey Token = null'.

I am using visual studio 2010 proffessional. tried using visual studio 2013 but its failing to add a wpf user control to the element host at all. Would have used wpf but the problem is have a winforms project i have created already so i want to add wpf controls in it. any help would be much appreciated. thank you for reading