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Ask Justin Frankel
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Question: Which api did you used to add button to titlebar in reaper?
Asked by Ruchira (175.157.140.x) on January 17 2026, 6:03pm
Reply on January 17 2026, 9:14pm:

there's no API, it's a pain. There's classic code to use when DWM is disabled, which uses a subclass and WM_NCPAINT. Then there's the DWM mode which creates a separate layered window and parents it to the window etc. maybe I can put together a bunch of example code but also maybe a LLM already has the info.

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