Gets or sets the child control hosted by the WindowsFormsHost element.
Assembly: WindowsFormsIntegration (in WindowsFormsIntegration.dll)
An attempt was made to assign a top-level form as the hosted control.
Only one child control can be hosted, butcan have any number of children.
The child control cannot be a top-level form.
A WindowsFormsHost element (or a possible subclass).
An element that specifies the hosted Windows Forms control. Specifying the custom control in markup usually requires an xmlns mapping, see XAML Namespaces and Namespace Mapping for WPF XAML.
Available since 3.0