I cannot get the tuplet tool to do what I want it to do, and the user manual offers no suggestions.  I specify in the dialog box how many notes of a certain value I want to fit into a note of some larger value, and I seem to have some success up until the end of the bar.  For example, if I want three triplet eighths in the space of a quarter note, I enter this information into the dialog box, keeping the "display bracket/number" boxes checked.  I am then presented with the little squares that I can click and drag to form a bracket over the notes.  I then select three eighth notes to enter, and have success the first time, but then if I need to enter another set of triplets, the system will stop me before I can enter the third eighth note of the set.  So instead of two sets of triplets, I will get one set of triplets and two eighths (forming a quarter note value) at the end of the bar.  Please advise.