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How can i make a window with another window in it that i can minimize and maximize and close?

you are talking about a multiple document interface or MDI. please search the forum for related topics. AFAIK, you can fake this behavior, but you will not get a true MDI from AHK.

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just like the SmartGUI. I want to make my GUI support multiple windows

Well, multiple GUIs and MDI are two fairly different things. For MDI, I would start here.

To create multiple GUIs per script, though, is much simpler. Here is an example:



You may also want to look into Gui, #:Default for a script using multiple GUIs.

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Tnx TDMedia for your help. Anyways this one solved my problem... DllCall("SetParent", "uint", SubhWnd, "uint", MainhWindow). My problem right now is that ifwinexist cannot detect a child window owned by a parent. Do you know any solution??

That's a good question. I myself haven't had to use child windows yet, so I don't know if such a thing is possible through AHK. Intuitively, though, you would probably have to use some DLLCalls to get that done too. However, take what I say with a grain of salt, as I have no experience in the area.

[EDIT]
Afterthought - you may be able to work around this issue by setting a variable when a specific GUI is made within the script itself. I don't know for sure, but AHK probably receives some sort of "grabbable" notification when a child is closed (are "children" still considered GUIs - able to have GUI#Close: labels?), so if you can dump it to a variable, it would be possible to tell when a window doesn't exist either.
[/EDIT]

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Tnx again! I would do as you said

Be sure to tell me how it goes - now I'm interested

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I think winactive() can be used, let me try....