Option to set a Callback in a Timeline that triggers based in Progress

Currently, you can add a Callback to a Timeline and have it fired based on the Delay, like this:

  <Callback Handler="{callback}" Delay="desired point in time" />

However, it would be useful to also have an option so that the callback fires at a certain “progress”, like:

  <Callback Handler="{callback}" Progress="progress from 0 to 1" />

Use AtProgress, it’s the option you want.

<Callback Handler="{callback}" AtProgress="0.5"/>