Linear Color Curve Actor does not allow Alpha Changes

A Linear Color Curve Component added into the Content Browser has a listing for Red, Green, Blue and Alpha, but will not allow values to be added to the Alpha graph.

Also Reproduced in Main Promotable-CL-2498147

1. Open QAGame Editor
2. Under Misc. Add a Curve Component of Class Linear Color
3. Open new Linear Curve Component
4. Turn Off Red, Blue and Green (Eyeball)
5. In Alpha Graph, Attempt to Shift-Click and add a Key

RESULTS: You cannot add a key to the Alpha

EXPECTED: You can add keyframes to Alpha Graph