How do I change a value after a _click event has taken place?

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C#

UWP

I am creating a small game in UWP using C# and a physics library.

After some rather painful debugging, I have discovered that some code has been run behind the scene after a _Click event has been executed. This code needs to fire before my event code has completed.

In other words, this is what I want to happen:

1. user clicks button
2. some code executes via the _Click event
3. the final parts of this code fetches some attributes from a list, regarding the object just added to the list.

What happens now is this:
1. user clicks button
2. some code executes via the _Click event
3. the final part of the code tries to fetch some attributes, but as these haven't been modified yet in the underlying code, my code crashes.

I have no problem waiting a few milliseconds or so before fetching the updated object, so I can easily cut out the final code and place it in a method that runs a little later in time (I'd prefer this to digging into the underlying code library). Thus, I wonder if there is a something similar to a Page_Loaded event, taking place AFTER the underlying code has been updated correctly.

Here is my _Click code. Nothing strange here really. The problem is that the underlying code runs AFTER the closing of this method. I need a way to run more code AFTER that underlying code has finished running.

private void btnAddBomber_Click(object sender, RoutedEventArgs e)
{
    ucBomber bomber = new ucBomber();
    AddObjectRandomPosition(bomber, 50, 1000, 120, 120, 174, 100);
}

What I have tried:

I have tried to find a suitable event, but to no avail. I am not sure of how to search for this.