如何创建一个可以删除其他控件的UserControl？

In WinForms, how can I create a UserControl that when I put on my form I can then add other controls inside by dragging them from the toolbox, the same way as with all containers controls (panels, group boxes, etc)? I've tried to add controls by dropping them in my control but then when I move my control the controls I added stay right where they are, which wouldn't happen if instead of my control I would use a tha