Now Playing -> Time Line: different behaviour between 'delete' button and 'delete' menu items

Steps:
1. In Timeline, you can left click a track, and select 'Delete' in the context menu to delete it. It will pop up a message box: Delete select tracks, waiting for confirm.
2. But if you select the track, then click the 'delete' button on the top of timeline, no message box pops up, it just remove the select track(s) from timeline.

Result:
Keep them same because their should be same behaviour