Contanier control for external form editing.
When this property is assigned, the edited form is inserted into assigned control,
if this property is null, the form is edited on-the-fly. When DesignContainer is assigned,
the DesignControl property is used only for obtaining the top-level edited form.
Namespace:
Greatis.FormDesignerAssembly: Greatis.FormDesigner (in Greatis.FormDesigner.dll)