CompositeControl: ambiguous GetContents error message, test inheritance #2711

Job	Run time
Build published projects without warnings (Release)	4m 21s
Build published projects without warnings (Debug)	5m 20s
Build all projects without errors	13m 34s
.NET unit tests (ubuntu-latest)	5m 22s
JS unit tests	1m 48s
.NET unit tests (windows-2022)	13m 55s
.NET unit tests (macOS-latest)	7m 16s
UI tests (chrome, ubuntu-latest, Production, Default)	17m 57s
UI tests (chrome, windows-2022, Development, Default)	23m 3s
UI tests (firefox, ubuntu-latest, Development, Default)	23m 13s
UI tests (firefox, ubuntu-latest, Production, Default)	20m 18s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	21m 25s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	18m 3s
	2h 55m 35s

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