How do you put a WPF control into a Windows Forms Form? Most likely I will be inserting my WPF control into a Windows.Forms.Panel.
Summarizing the above answers for quick reference:
if you don't want to mess with editing the project and want to stick with the designer:
be sure to add reference for WindowsFormsIntegration.dll which is normally from window's \reference assemblies\microsoft\Framework...
and if you are using a wpf usercontrol in your solution, you probably already got references to
System.Windows.Presentation,System.Windows.Activities, System.Windows.CompnentModel, System.Windows..RunTime, System.Windows.WorkFlowServices, System.Xaml.
otherwise be sure to add the required foregoing references.
in a windows form member you add the wpf usercontrol myWpfUsrCtl to the windows form as follows
void addWpfUsrCntl()
{
var elemthost1 = new System.Windows.Forms.Integration.ElementHost();
elemthost1.Dock = DockStyle.None; // change to to suit your need
// you can add the WPF control to the form or any other desired control
elemthost1.Parent = this;
//elemthost1.AutoSize = true; // change to to suit your need
... // change to to suit your need
elemthost1.Child = myWpfUsrCtl; // Assign the WPF control
}