This action event can be used to change the z-position of an object. The z-position is the position where the object is inserted in the stack of objects. You need to select an object and enter a delta value. The delta value is a numeric value that specifies how the z-position of the object should be changed. The object is moved by 'delta' positions to the front or back (negative values move the object to the back, positive values move it to the front).
You can also use variable names instead of numeric constants with this action event. It is even possible to enter complete expressions like "x+1" or function calls for maximum flexibility here.