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 End-User Documentation

AlertControl.BeforeFormShow Event

Fires before displaying an alert window and allows it to be customized.

Namespace:DevExpress.XtraBars.Alerter
Assembly:DevExpress.XtraBars.v17.1.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type DevExpress.XtraBars.Alerter.AlertFormEventArgs containing data related to this event.

Expanded Remarks

Handle the BeforeFormShow event to customize an alert window before it's displayed on-screen. You can access and change the caption, description and other display options of the currently displayed alert window via the event's e.AlertForm.Info parameter. Use the following options to change an alert window's settings:

  • e.AlertForm.Info parameter allows the window's caption, description and other display options to be modified.
  • e.AlertForm.OpacityLevel parameter allows the window's opacity level to be changed.

    Alert windows appear on-screen with a fade-in effect, and by default they are semi-transparent at the end of the fade-in. The OpacityLevel parameter specifies the final opacity level of the fade-in effect. A 0 value means the window is transparent. A value of 1 makes the window opaque.

  • e.AlertForm.Size parameter allows the window's size to be changed.
  • e.Location parameter allows the window's location to be manually specified. By default, the window's location is controlled by the FormLocation property.

Expanded Example

By default, an alert window's on-screen appearance is semi-transparent. The following code shows how make an alert window's on-screen appearance opaque. To change the opacity level, handle the BeforeFormShow event.

Expanded See Also

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