Fix Panels' color not changing #648

Job	Run time
before_build	19s
build_windows_cmake (Release, x64, amd64)	4m 27s
build_windows_msys2 (Release, x86_64)	5m 20s
build_windows (Release, x64)	3m 31s
build_windows_msys2 (Release, i686)	4m 51s
build_windows (Release, Win32)	3m 11s
build_windows_msys2 (Debug, x86_64)	4m 39s
build_windows (Release, ARM64)	4m 10s
build_windows_msys2 (Debug, i686)	4m 13s
build_windows (Debug, x64)	5m 32s
build_windows (Debug, Win32)	3m 51s
build_windows (Debug, ARM64)	2m 46s
	46m 50s

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