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Report From: Delphi-BCB/VCL/MDI Support [ Add a report in this area ]

Report #: 89043

Status: Reported

Assigning the Visible property for MDIChild form at design time

Project: Delphi

Build #: 14.0.3593.25826

Version: 15.0

Submitted By: Serge (Developer Express Support)

Report Type: Minor failure / Design problem

Date Reported: 10/18/2010 12:04:23 AM

Severity: Infrequently encountered problem

Last Updated: 1/16/2012 7:57:14 PM

Platform: All platforms

Internal Tracking #:

Resolution: None (Resolution Comments)

Resolved in Build: : None

Duplicate of: None

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Description

The VCL technology prohibits setting the Visible property to False for MDIChild forms. For example, a "Cannot hide an MDI Child Form" exception occurs if this property is changed at design time in Delphi7 IDE. With Delphi XE it is possible to set the Visible property to False at design time. So, it is possible to create an invisible MDIChild form.

Steps to Reproduce:

1. Compile and run the sample.
2. An invisible MDIChild form is created.
3. Click button1 to display it.

Expected result:
Delphi XE IDE should prohibit changing the Visible property to False for MDIChild forms. We expect the same behavior as in the Delphi7 IDE.

Actual result:
With Delphi XE, it is possible to set the Visible property to False at design time. So, it is possible to create an invisible MDIChild form.

Workarounds

None

Attachment

Sample.zip

Comments

Tomohiro Takahashi at 10/20/2010 7:07:43 PM -

>[Steps]
> 3. Click button1 to display it.
Could you tell us more detail about your issue to verify it?
- expected result
- actual result

Serge (Developer Express Support) at 1/15/2012 11:38:50 PM -

The expected result: the Delphi XE IDE should prohibit changing the Visible property to False for MDIChild forms. We expect the same behavior as in the Delphi7 IDE.

Actual result : With Delphi XE it is possible to set the Visible property to False at design time. So, it is possible to create an invisible MDIChild form.

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