Why not hide this window?

[Turbe$Z]

GUIEditor = {
    button = {},
    window = {}
}

        aa = guiCreateWindow(0.34, 0.29, 0.32, 0.28, "Rang vásárlás PÉZ-ből", true)
        guiWindowSetSizable(aa, false)
		guiSetProperty(aa, true)

        GUIEditor.button[1] = guiCreateButton(9, 23, 440, 41, "V.I.P - 100 PÉZ", false, aa)
        guiSetFont(GUIEditor.button[1], "default-bold-small")
        guiSetProperty(GUIEditor.button[1], "NormalTextColour", "FFFF0000")
        GUIEditor.button[2] = guiCreateButton(9, 74, 440, 41, "Moderátor - 1000 PÉZ", false, aa)
        guiSetFont(GUIEditor.button[2], "default-bold-small")
        guiSetProperty(GUIEditor.button[2], "NormalTextColour", "FFFF0000")
        GUIEditor.button[3] = guiCreateButton(9, 125, 440, 41, "----", false, aa)
        GUIEditor.button[4] = guiCreateButton(9, 176, 440, 41, "----", false, aa)
        GUIEditor.button[5] = guiCreateButton(163, 226, 134, 20, "Bezárás", false, aa)    

when i connect to the server, this window show automatic, but i want fix this with guiSetProperty but doesn't working, why?

[Gravestone]

Use guiSetVisible to manage visibility.

[Simple0x47]

If you don't want it to appear automatically just get that Gui functions into a function handler of the event you want it to show up. And then use like @Gravestone said the guiSetVisible.