on a form is enabled.You can use the CloseButton property to specify whether the Close button on a form is enabled.
Setting
The CloseButton property uses the following settings.
| Setting | Visual Basic | Description |
|---|---|---|
| Yes | True (–1) | (Default) The Close button is enabled. |
| No | False (0) | The Close button is disabled and the Close command isn't available on the Control menu. |
You can set the CloseButton property by using the form's property sheet, a macro, or Visual Basic.
You can set the CloseButton property only in form Design view.
Remarks
If you set the CloseButton property to No, the Close button remains visible but appears dimmed (grayed), and you must provide some other way to close the form — for example, a command button or custom menu command that runs a macro or event procedure that closes the form.
Tip You can also close the form by pressing ALT+F4.