UserControl

//AlertInfo案例
AlertInfo info = new AlertInfo("提示", "修改成功！");
info.Image = DevExpress.Images.ImageResourceCache.Default.GetImageById("comment", DevExpress.Utils.Design.ImageSize.Size32x32, DevExpress.Utils.Design.ImageType.Colored);
alertControl1.Show(this.ParentForm, info);

form使用 this    usercontrol使用this.ParentForm 


//form和usercontrol之间的加载关系
DevExpress.XtraTab.XtraTabPage page = new DevExpress.XtraTab.XtraTabPage();
SmtCutLine f = new SmtCutLine();
page.Text = "项目任务切换";
f.Dock = DockStyle.Fill;
f.Show();
page.Controls.Add(f);
this.xtraTabControl1.TabPages.Add(page);
xtraTabControl1.SelectedTabPage = page;