Combo box drop-down invisible

confre — Thu, 09 Apr 2026 11:11:28 -0000

Hi,
I created a combo box and I need to know when the drop‑down menu is open, in order to avoid hiding the combo box while the drop‑down is visible.
Alternatively, if it’s not possible to detect whether the drop‑down is open, I would like to know how to close or hide the drop‑down programmatically when the combo box is made invisible.

I'm using Codesys 3.5 SP19 on IFM CR1074 without touch screen (with standard keyboard handling)
Thanks.

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Combo box drop-down invisible