To reproduce : this.radCollapsiblePanel1.IsExpanded = false; for (int i = 0; i < 5; i++) { RadButton btn = new RadButton(); btn.Text = "Left" + i; btn.Location = new Point(10, 45 * i); this.radCollapsiblePanel1.Controls.Add(btn); RadButton btn2 = new RadButton(); btn2.Text = "Right" + i; btn2.Location = new Point(140, 45 * i); this.radCollapsiblePanel1.Controls.Add(btn2); } Workaround: this.radCollapsiblePanel1.IsExpanded = false; this.radCollapsiblePanel1.ControlsContainer.AutoScroll = true;