If the 'Layer' in this Document is set at -2, all objects will be accessible with the mouse, except the yellow -3.
To gain access to the yellow -3, the 'Layer' needs to be set at -3.
The numbers in each of these boxes represents the the Z-Indexes which have been manually set.
-2
-1
Layer: Document Z-Index
The z-index property specifies the stack order of an object. An object with greater stack order is always in front of an element with a lower stack order.
If objects exist with differing Z -Indexes, the Document Layer must be matched at or below the object which is to be handled.
Use the Refresh button regularly when altering the Document Layer or Z-Index of an object.