Hi,
Thanks for your interest in Syncfusion Essential Studio. Please refer to the following code on this.
[C#]
//Make the current Form an MDIContainer.
this.IsMdiContainer = true;
[C#]
//Setting for MDIChild to be dock enabled.
Form frm = new Form();
frm.Name = "ChildForm"
frm.TopLevel = false;
frm.FormBorderStyle = FormBorderStyle.None;
dockingManager1.SetEnableDocking(frm, true);
frm.Show();
[Sample]
http://www.syncfusion.com/uploads/redirect.aspx?file=DockingApplication_FormDockedInAForm_d40673b4.zip&team=supportPlease try this and let me know if this helps.
Regards,
Nanda