System.Windows.Forms.Control.GetTopLevel C# (CSharp) Method

		protected bool GetTopLevel() {
			return is_toplevel;
		}

			public virtual void Add (Control value)
			{
				if (value == null)
					return;
				
				Form form_value = value as Form;
				Form form_owner = owner as Form;
				//TODO:
				bool owner_permits_toplevels = true;
				// (owner is MdiClient) || (form_owner != null && form_owner.IsMdiContainer);
				bool child_is_toplevel = value.GetTopLevel ();
				bool child_is_mdichild = false;
				//form_value != null && form_value.IsMdiChild;
				if (child_is_toplevel && !(owner_permits_toplevels && child_is_mdichild))
					throw new ArgumentException ("Cannot add a top level control to a control.", "value");
				/*
				if (child_is_mdichild && form_value.MdiParent != null && form_value.MdiParent != owner && form_value.MdiParent != owner.Parent) {
					throw new ArgumentException ("Form cannot be added to the Controls collection that has a valid MDI parent.", "value");
				}
				*/				
				
				//value.recalculate_distances = true;
				
				if (Contains (value))
				{
					owner.PerformLayout ();
					return;
				}
				
				if (value.parent != null)
				{
					value.parent.Controls.Remove (value);
				}
				
				all_controls = null;
				list.Add (value);
				
				value.ChangeParent (owner);
				
				//value.InitLayout();
				
				//if (owner.Visible)
				//	owner.UpdateChildrenZOrder();
				owner.PerformLayout (value, "Parent");
				owner.OnControlAdded (new ControlEventArgs (value));
			}