Cannot add additional keys after the curve editor has been selected in UMG

If the user creates an animation timeline in UMG and then clicks the Curve editor then the user will no longer be able to place keys anywhere else on the timeline.

1. Open the editor
2. Create a new widget blueprint
3. Add a button to the designer tab
4. Create a new animation
5. Add a key frame for the X position of the button
6. Click the Curve Editor button
7. Try to move the scrub bar and place another key frame
8. Notice that you cannot move the scrub bar and place another key frame

Expected: The user would be able to scrub through the timeline and add additional key frames
Result: The scrub bar cannot be moved and the user can not add new key frames