-Visual Effect object goes out of focus due to this VFX Event Tester window closes.
-After changing colour in the Color picker window, colour does not reflect in "Color Event Attribute".

Steps to repro:
1. Open the attached Project.
2. Select Visual Effect > Enable Show Event Tester in Scene View.
3. In VFX Event Tester > Click "+" > Standard > Color.
4. Edit the Color.

Actual Result:
VFX Event Tester window disappears on clicking on the colour picker.

Expected Result:
VFX Event Tester window should not be disappeared.

Reproducible in:
2020.1.0a23, 2019.3.1f1, 2019.3.0f6 (27ab2135bccf), 2019.2.0a6.

Tested with Package Version: 7.1.8, 7.1.7, 7.1.5, 6.7.1.

Note:
-VFX Event Tester Window is available from 2019.2.0a5.

Environment:
Occurring on Windows 10 & Mac 10.15.