How can I get cross fade/dissolve of both audio and video?

Question

I want to centre the coss fade/dissolve transition on the clip boundary.  I can do this with the video cross dissolve but not the audio cross fade - for the audio, the Alignment facility in the Edit transition is greyed out and the transition can only be located to the left or right of the clip boundary.  It seems an obvious requirement and surprising that audio cross fade is not, optionally at least, an integral part of the video cross dissolve (as it is in Corel VideoStudio).

Answer 1

Steve - thanks for the reply.
Yes I am working in Timeline mode and have done what you suggest - i.e., drag in the video transition followed by the audio transition.  However, despite my original update to the question, I now cannot centre the audio transition on the clip boundary - it worked once as reported but not since.
Basically when I drag the audio cross fade transition on to the timeline, it will only let me drop it to the left or right of the clip boundary.  I then hightlight the transition and click on the edit transition button.  The properties are displayed and I can alter the length of the transition but the wording in the alignment row of the properties is greyed out with the setting being "End at cut".  The down arrow head to give the drop down with the other settings is grey and inactive.
I don't understand how I made it work once!
Any ideas?
Frank