zset tree=%%I
Copy a "handle" to the
object into a local variable
set %%I.Indentation=20
Define a value for the property
Indentation of this obect (this property defined
the indentation step size in pixels)
(The macro can also be used in combination with properties of the
object.)
zset tree.ImageList=^$W(%%CurrWin,"G","ImageList1")
Define a property value that, by itself,
is a handle to another object
(the value that is obtained through this macro can be used
as an object-reference itself).
ZSET Lev1=%%I.Nodes.Add(,1,,"Top-Level")
Define a local variable to hold a
handle to another object that is "pointed to" by
the tree object.
(The class-function Add adds a "branch" to the
"tree" and returns a handle to the object that represents
the "branch".)