fix issue where tree item doesn't expand when collapsible state is expanded (#2212)

samples/sqlservices/src/controllers/treeDataProvider.ts

@@ -77,7 +77,7 @@ export class TreeNode implements sqlops.TreeComponentItem {
 
 	public get collapsibleState(): vscode.TreeItemCollapsibleState {
 		if (!this._isAlwaysLeaf) {
-			return vscode.TreeItemCollapsibleState.Collapsed;
+			return vscode.TreeItemCollapsibleState.Expanded;
 		} else {
 			vscode.TreeItemCollapsibleState.None;
 		}

src/sql/parts/modelComponents/tree/treeDataSource.ts

@@ -55,4 +55,8 @@ export class TreeComponentDataSource implements IDataSource {
 	public getParent(tree: ITree, node: any): TPromise<any> {
 		return TPromise.as(null);
 	}
+
+	public shouldAutoexpand(tree: ITree, node: ITreeComponentItem): boolean {
+		return node.collapsibleState === TreeItemCollapsibleState.Expanded;
+	}
 }