App Header Button

Use the App Header Button only when you want to customize the App Header by adding custom buttons to the toolbar.

Actions

The App Header Button supports the following actions.

Action	Description
Enable	Enables the button.
Disable	Disables the button
Execute expression	Enables dynamically enabling / disabling the button by calling the EnableIf(boolean expression) function. See example below.

Example - Execute expression

To dynamically set the enabled state of the button based on whether the _state.Counter is 0 or not, enter the following expression in the Instructions panel:

EnableIf(_state.Counter === 0);

Events

The App Header Button supports the following events.

Event name	Description
Tapped	This event is raised when the button is clicked.

Button image

You need to specify the image displayed by the button. You can select from a range of built-in images, use one of your custom uploaded images, or refer to an image url. To specify the image, select the button and specify the Image in the property panel.

Styling

Apart from specifying an image, the App Header Button's style cannot be customized. This is by design, and it automatically inherits the standard appearance of system App Header buttons.