AutoHotkey Community

[umek]

Let me ask one question. Can the UDS_HOTTRACK style command be used to highlight a specified control in my ahk Gui
by using a button referring to a subroutine? I ask this because I would like to use it to highlight controls if the required fields
are not present (or are blank) when submitting the Gui! (like a kind of validation)
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Works on my machine!

[PhiLho]

I am not sure to fully understand what you are trying to do, but if I grasp correctly the UDS_HOTTRACK style, it is visible only when the mouse cursor is hovering over the UpDown control.
If you want to highlight the problematic controls, you can do what I see frequently in Web forms: put a text beside the control, hidden by default, and display it in red if a problem is detected. The text can be a simple star * or an explaination of the required field.
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vPhiLho := RegExReplace("Philippe Lhoste", "^(\w{3})\w*\s+\b(\w{3})\w*$", "$1$2")

[umek]

That's a good idea. I often see them too but didn't consider this way of doing it. Indeed, there is not enough space on my Gui
to add further text but I will try recolor the existing lables of the input fields. Actually, my intention was to highlight the controls by
using <GuiControl, 1:Whatever, CtrlEdit1> (for example).

Thanks for this stumbling block ...
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Works on my machine!