You should be able to. You can test it by calling myControl.BringToFront(); The MDI Host is shown on top of the control by default, but you can’t tell because it’s transparent.
Check out this example for adding controls around the MDI Window: https://github.com/iceteagroup/wisej-examples/tree/2.0/MDIExample/MDIExample It shows a Toolbar at the top of the MDI host form.
If you need a common control on all of your MDI child controls (such as a toolbar) I would suggest creating a custom Form with the button and to subclass your other windows from that.
Let me know if you have any questions about it!
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