Memory Leak in RadPageView

Hi,

Memory leakage issue found while disposing form that added in RadPageView Control.  But the memory not decresed even I disposed form and RadPageViewPage object. Please Help. I am attaching sample project and demo video with question.

Following are the code samples

Adding from to PageView

            frmSales frm = new frmSales();
            frm.Dock = DockStyle.Fill;
            frm.TopLevel = false;
            frm.TopMost = true;
            frm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            var page = new RadPageViewPage();
            page.Controls.Add(frm);
            radPageView1.Pages.Add(page);
            radPageView1.SelectedPage = page;
            frm.Show();

Removing Form from PageView

 RadPageViewPage page = radPageView1.Pages[radPageView1.Pages.Count - 1];
                    RadForm frm = (RadForm)page.Controls[0];
                    frmSales obj = (frmSales)frm;
                    radPageView1.Pages.Remove(page);
                    page.Dispose();
                    page = null;
                    obj.ClearMem2();
                    obj.Close();
                    obj.Dispose();
                    obj = null;
                    GC.Collect();
                    GC.WaitForPendingFinalizers();
                    GC.Collect();

Any help will be very appreciated. Thanks  in advance