src/vs/workbench/browser/parts/compositePart.ts/CompositePart/actionViewItemProvider
class CompositePart:	protected actionViewItemProvider(action: IAction): IActionViewItem | undefined {

		// Check Active Composite
		if (this.activeComposite) {
			return this.activeComposite.getActionViewItem(action);
		}

		return createActionViewItem(this.instantiationService, action);
	}