When working in the visual states timeline, if I select multiple elements in the timeline, make changes, and then try to select a single element, the selection is not registered until all elements are deselected. This seems to only be an issue if there are no pre-existing keyframes in the timeline. Everything works as intended if there are already keyframes in the timeline.

Repro Steps:

1. Create a Studio Project with a MainPage.xaml
2. Add 3 TextBlock elements to the stage. Ensure the TextBlocks are aligned to the left, center, and right, respectively.
3. Navigate to the Animations Tab and create a Visual State. Select "Default Transition" to open up the timeline. Ensure that the record button is selected so you can create keyframes.
4. Select all 3 TextBlocks
5. With all 3 TextBlocks still selected, navigate to the properties panel and lower their opacity to 0%
6. In the timeline's navigator, try to select one of the TextBlocks.
7. Observe how selecting one of the TextBlocks does not deselect the remaining 2 textblocks.

Expected Results:
Selecting a single TextBlock in the timeline navigator while 3 are already selected will deselect undesired TextBlocks and select the designated TextBlock.