Knowledge Base

PRB: Min and Max Buttons Disappear when ControlBox = .F.

Article ID: 157725

Article Last Modified on 10/15/2003

Microsoft Visual FoxPro 5.0 Standard Edition
Microsoft Visual FoxPro 6.0 Professional Edition

This article was previously published under Q157725

SYMPTOMS

In Visual FoxPro 5.0, the Minimize, Maximize, and Exit buttons disappear from the title bar of a form when the ControlBox property of a form is set to False(.F.). This behavior is different in Visual FoxPro versions 3.0 and 3.0b, where the Control-Menu box in the upper left corner of the form disappears and the Exit button only becomes disabled, when the ControlBox property is set to False(.F.).

CAUSE

This behavior in Visual FoxPro 5.0 occurs because FoxPro no longer draws all of its non-client areas. The operating system, which is Windows 95 or Windows NT 4.0, takes care of this operation. When the ControlBox property of a form is set to False(.F.), Windows 95 or Windows NT 4.0 detects that there is no control box. It then presumes that you do not want to perform any of the operations that were contained within th1s control, such as Minimize, Maximize, or Exit. Therefore, the controls are removed.

STATUS

This behavior is by design.

MORE INFORMATION

The ControlBox property is used to specify whether a Control-menu box appears in the upper-left corner of a form or toolbar at run time. When the ControlBox property is set to False(.F.), the control-menu box disappears from the upper left corner of a form; however, when the ControlBox property is set to True(.T.), the control-menu box re-appears again.

Steps to Reproduce Behavior

Create a form in the Form Designer.
Set the ControlBox property of the form in the Properties windows to False(.F.).

Immediately after setting the ControlBox property to False(.F.), the Maximize, Minimize, and Close buttons disappear from the form title bar.

Additional query words: kbdse VFoxWin

Keywords: KB157725