Exending a clip that sits under a transition

Hi there,

What's the simplest way to extend the end of a clip that sits underneath a transition. When I click on the middle of the transition and move it right, it appears to slip rather than extend and is eating into the start point of the following clip.

Sureley there must be a way of doing this without deleting the transition, extending the clip and then reapplying the transition again??

Bar at the top of the transition. There are tabs on each end that allow you to ripple the shot.

Thanks Tom, as always.