If specified, Set will increment the target property by the provided amount rather than overwriting it.

Example

The following example consists of a red Rectangle and a button that fades its color a little step towards blue with each click.

<Button Text="Make background more blue">
    <Clicked>
        <Set Target="background.Color" Increment="-0.2, 0, 0.2, 0" />
    </Clicked>
</Button>
<Rectangle ux:Name="background" Color="1, 0, 0, 1" />