Dropdown menus don't open when program is moved inside another program

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I have two different programs. The first has a border-less form that has a DropDown Menu at the top. The second program also has a border-less form, but has fake borders and title bar with control buttons. The second program also has a panel in the centre that is anchored in all four directions. I want to be able to place the the built first program inside the panel, and still have the first program's controls fully function.

What I have tried:

I have used the SetParent to move the built first program into the panel by using the first program's process's MainWindowHandel. When I do this though, the drop down menus no longer drop down. I have tried other controls in the first program like buttons and textboxes, and they interact correctly. Does anyone have any idea why a dropdown menu isn't working?
Thanks in advance

Posted 21-Dec-20 9:53am

LeMS_Studios

Updated 21-Dec-20 11:17am

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Gerry Schmitz · Answer 1 · 2020-12-21T11:18:00

Solution 1

Quote:
When you change the parent of a window, you should synchronize the UISTATE of both windows. For more information, see WM_CHANGEUISTATE and WM_UPDATEUISTATE.

SetParent function (winuser.h) - Win32 apps | Microsoft Docs[^]

Posted 21-Dec-20 11:18am

Gerry Schmitz