.Detach() not working for LogicalParent

[WileyNg]

        protected override void OnDragOver(DragEventArgs e)
        {
            base.OnDragOver(e);
            if (e.Data.Contains(dragType))
            {
                int sourceIndex = (int)Math.Floor(mousedownPoint.Value.Y / _modRowHeight);
                int insertIndex = (int)Math.Floor(e.Location.Y / _modRowHeight);
                if (!edited)
                {
                    controlListForDisplay = new List<Control>();
                    controlListForDisplay.AddRange(ControlList);
                }
                edited = true;

                    controlListForDisplay.RemoveAt(sourceIndex);
                    if (sourceIndex < insertIndex) insertIndex--;
                   controlListForDisplay.Insert(insertIndex, ControlList[sourceIndex]);
                   DynamicLayout layoutForDisplay = new DynamicLayout() { };
                   foreach (Control control in controlListForDisplay)
                        layoutForDisplay.Add(control);
                   Content = layoutForDisplay;
                
            }
        }

An exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll but was not handled in user code
Specified element is already the logical child of another element. Disconnect it first.

I am trying to do DragDrop with DynamicLayout and Drawable since GridView doesn't allow me to change the individual RowHeight.
The codes throw an exception about having the logical parent of another element.

I tried ControlList[sourceIndex].Detached() but it didn't work.

@cwensley I really appreciate your help on this! as usual a small pointer for me is enough!