extensions/references-view/src/calls/model.ts/CallItemDataProvider/getTreeItem
class CallItemDataProvider:	getTreeItem(element: CallItem): vscode.TreeItem {

		const item = new vscode.TreeItem(element.item.name);
		item.description = element.item.detail;
		item.tooltip = item.label ? `${item.label} - ${element.item.detail}` : element.item.detail;
		item.contextValue = 'call-item';
		item.iconPath = getThemeIcon(element.item.kind);
		item.command = {
			command: 'vscode.open',
			title: localize('open', 'Open Call'),
			arguments: [
				element.item.uri,
				<vscode.TextDocumentShowOptions>{ selection: element.item.selectionRange.with({ end: element.item.selectionRange.start }) }
			]
		};
		item.collapsibleState = vscode.TreeItemCollapsibleState.Collapsed;
		return item;
	}