The maximize/minimize boxes (also known as a Zoom boxes on Mac OS) work differently depending on the platform or the type of window that is being used. The following describes the status of the zoom box depending on the window type and the status of the Resizable form attribute.

ON WINDOWS:


With the Resizable check box checked in the Form Properties:

Window's type Visible Active
0 Yes Yes
1 No No
2 Yes Yes
3 Yes Yes
4 Yes Yes
5 Yes Yes
8 No Yes
720 No No


With the Resizable check box unchecked in the Form Properties:

Window's type / Visible / Active
0 Yes Yes
1 No No
2 Yes Yes
3 Yes Yes
4 No No
5 No No
8 No No
720 No No
ON MACOS:


With the Resizable check box checked in the Form Properties:

Window's type / Visible / Active
0 Yes Yes
1 No No
2 Yes Yes
3 Yes Yes
4 Yes Yes
5 Yes Yes
8 Yes Yes
720 Yes Yes

With the Resizable check box unchecked in the Form Properties:

Window's type / Visible / Active / When clicked
0 Yes No Move to top-left corner
1 No No
2 Yes No Move to top-left corner
3 Yes No Move to top-left corner
4 No No
5 No No
8 No No
720 No No