The Mouse Down Button widget is supported in NiagaraAX-3.4 and later, only. When configured as part of a Px page, this widget allows for buttons to adjust the camera Iris and the Focus and so that they are functionally equivalent to the Iris and Focus buttons that are provided in the Live Video view (see Live Video view ). The Mouse Down Button widget is available in the videoDriver palette. You can drag it directly from the palette onto a Px page where you can adjust the widget size and shape to fit the desired area on the page. See Mouse Down Button widget for more details.