Class parameters not seen in all methods

Question

Dear experts,
Please help!
I have two classes in my program:
Class "screen_init" and class "screen_handler".
Each class has its own constructor plus other methods.
For example class  "screen_handler" has methods "constructor", "handle_node_double_click",
"handle_picture_double_click", "handle_textedit_double_click".
In Constructor of class "screen_init" I do:
- define event_handler:
Data  event_handler type ref to screen_handler
- create an object event_handler: 
        Create object  event_handler
           exporting textedit = textedit
                      tree = tree.
In definition section of class "screen_handler" I define constructor as:
   methods: constructor importing
                  textedit type ref to cl_gui_textedit
                  tree type ref to cl_gui_simple_tree.
When the program creates an object  event_handler - then the Constructor of  class "screen_handler" is run.
The problem is that textedit and tree are successfully received in the Constructor of "screen_handler" class. But when it gets to any other method of "screen_handler" class ( method "handle_textedit_double_click", for example) - these objects are empty.
I need tree object when method "handle_textedit_double_click" is run - so I could read textedit and then  repopulate the tree depending on textedit value.
Please note that textedit and tree are defined in both classes in Public section:
class screen_init definition.
public section.
    data: textedit type ref to CL_GUI_TEXTEDIT,
            tree type ref to cl_gui_simple_tree.
class screen_handler definition.
  public section.
data: textedit type ref to CL_GUI_TEXTEDIT,
          tree type ref to cl_gui_simple_tree
Thank you,
Tatyana.

Answer 1

Hello Tatyana
The only possible reason I see is that you do no save the imported instance into the public instance attributes. Presumably the coding of your CONSTRUTOR method is missing the following coding:
Recommendation: rename your instance attribute, e.g.
class screen_init definition.
public section.
    data: mo_textedit type ref to CL_GUI_TEXTEDIT,
            mo_tree type ref to cl_gui_simple_tree.
class screen_handler definition.
  public section.
data: mo_textedit type ref to CL_GUI_TEXTEDIT,
          mo_tree type ref to cl_gui_simple_tree 
"       Create event handler instance
        Create object  event_handler
           exporting textedit = textedit  " instance IS BOUND
                      tree = tree.               " instance IS BOUND
" Here we are inside the CONSTRUCTOR
method CONSTRUCTOR.
  me->mo_textedit = textedit.  " save the imported instance to instance attribute
  me->mo_tree      = tree.       "  dito
endmethod.
Regards
  Uwe