C# Panel에 Winform 추가 public SubRTCForm formRTC = new SubRTCForm (); MainForm.cSystem.formRTC.TopLevel = false; // TopLevel 속성을 false 로 해 줄 것 . MainForm.cSystem.formRTC.TopMost = false; panelManager.Controls.Add ( MainForm.cSystem.formRTC ); MainForm.cSystem.formRTC.Visible = true;