'How to enable the maximize button in the gui?

When i create a GUI her maximize button is grayed out/disabled, how can i enable it?

Example:

Gui, Add, Button, w100 h30, Button
Gui, Show, w400 h300

I was reading the docs and found this parameter Maximize: Maximizes and activates the window.

It does maximize the GUI as soon its launched:

Gui, Show, Maximize w400 h300

However, i would like to enable maximizing/restoring upon clicking the maximize button.



Solution 1:[1]

You need to add the flag +Resize

From docs:

Resize: Makes the window resizable and enables its maximize button in the title bar. To avoid enabling the maximize button, specify +Resize -MaximizeBox.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Cesar