LayoutFarm.UI.UISurfaceViewportControl.AddContent C# (CSharp) Method

        public void AddContent(RenderElement vi)
        {
            this.rootgfx.TopWindowRenderBox.AddChild(vi);
        }

        public void AddContent(RenderElement vi, object owner)
        {
            if (vi is RenderBoxBase)
            {
                if (owner is ITopWindowBox)
                {
                    var topWinBox = owner as ITopWindowBox;
                    if (topWinBox.PlatformWinBox == null)
                    {
                        FormPopupShadow2 popupShadow1 = new FormPopupShadow2();
                        IntPtr           handle1      = popupShadow1.Handle;


                        //create platform winbox
                        var newForm = new AbstractCompletionWindow();
                        newForm.LinkedParentForm    = this.FindForm();
                        newForm.LinkedParentControl = this;
                        newForm.PopupShadow         = popupShadow1;


                        UISurfaceViewportControl newSurfaceViewport = this.CreateNewOne(300, 200);
                        newSurfaceViewport.Location = new System.Drawing.Point(0, 0);
                        newForm.Controls.Add(newSurfaceViewport);
                        vi.ResetRootGraphics(newSurfaceViewport.RootGfx);
                        vi.SetLocation(0, 0);
                        newSurfaceViewport.AddContent(vi);
                        //-----------------------------------------------------
                        s_tmpHandle = newForm.Handle;//force newform to create window handle
                        //----------

                        var platformWinBox = new PlatformWinBoxForm(newForm);
                        topWinBox.PlatformWinBox = platformWinBox;
                        platformWinBox.UseRelativeLocationToParent = true;
                        subForms.Add(newForm);
                        s_tmpHandle = IntPtr.Zero;
                    }
                }
                else
                {
                    this.rootgfx.TopWindowRenderBox.AddChild(vi);
                }
            }
            else
            {
                this.rootgfx.TopWindowRenderBox.AddChild(vi);
            }
        }