Recolouring A Drawing Made With Brushes

[DiscoverIT]

I work with people who have disabilities and a user drew a tree using a brush.

It appears that you cannot recolour the tree - however if I ungroup the drawing and move the various elements apart, it is then possible to recolour the individual elements of the tree but then you have the problem of reassembling the tree back to its' original position. Is it possible to recolour the drawing in-situ?

On a separate question, where can I find explanations for the three cursors that I have added to the drawing - namely the broken arrow, text cursor and the square cursor? They seem to appear whilst I am attempting to recolour the tree.

Thank you for your help.