This post I will show how easy it is to use managed hosted controls (wcf). We will look at incorporating a text control with a spell checker enabled.
We will work backwards, final result looks like this.
Now lets go though it.
Right click on your form and add a managed host.
Select PresentationFramework and then the Textbox control.
On the init method, enable the spell check.
xpo can be downloaded from here for an example.