WPF control inside Winforms doesn't work?

Question

I have a winforms application, I wanted to add a WPF checkbox to this application, so I followed these steps :

1- Right click on the project name, then choose Add->User Control
2- I choose User Control (WPF) from the list
3- I add a check box to the WPF designer
4- I Build the application

The question : After adding an ElementHost to my Winforms App, and expand the Child property, I don't see any controls, There is only a message saying (Add a new or existing WPF control to begin)

What I'm doing wrong ?

Edit : I have also tried to add a reference to WindowsFormsIntegration but results are same

Answer 1

When you build the WPF user control, the control will be listed in the Toolbox. Drag the control to the element host.