Dynamically change icon name of push button

Question

Hi,
I would like to ask how to dynamically change the icon name attribute of a push button in dialog programming. What is the syntax for assigning an icon name during runtime?
I am currently doing a multiple selection function for KNA1-KUNNR.
Initially, the icon name is ICON_ENTER_MORE. When the user picks up more than one customer, it should automatically change to ICON_DISPLAY_MORE. How can I do this?
here's the code i currently have:
DESCRIBE TABLE kunnr_ran LINES l_kunnr.
IF l_kunnr > 1.
      g_add_multiple = 'X'.
  BT_MULT_CUST-icon_name = 'ICON_DISPLAY_MORE'.
ELSEIF l_kunnr = 1.
     CLEAR g_add_multiple.
  BT_MULT_CUST-icon_name = 'ICON_ENTER_MORE'.
ENDIF.
The name of my pushbutton is BT_MULT_CUST.
The code in ** is not correct. I don't know the syntax in SAP. But that is how it is done in VB for example.
Thank you.
che =)

Answer 1

If you have not found your answer already, please try the following:
1)  In screen layout painter: for the pushbutton in question (i.e. pb_multi_select), mark the "Output field" on the program attributes tab in the attributes window for the pushbutton.  Make sure that its visible length is at least 2 too.  This will "gray out" the "Text" and other fields.
2) In the TOP INCLUDE of the module program:  add a variable for the pushbutton that is of type "icons-text" and don't forget to include <icons>.  Below is an example
INCLUDE <icon>
DATA: pb_multi_select TYPE icons-text.
3) In a module called in the PBO modules for the screen that needs its button changed, call the function "ICON_CREATE" and pass at minimum the name of the icon and the field that you specified in step 2.  Below is an example using the icon "ICON_DISPLAY_MORE", "ICON_ENTER_MORE", and a flag variable "MULTI_SEL_INFO_EXISTS" that indicates if any multiple selection information has already been entered.  It would be set by the program (not automatically, but by coding) prior to the "IF" statement:
IF multi_sel_info_exists = 'X'.
  CALL FUNCTION 'ICON_CREATE'
      EXPORTING
         name = 'ICON_DISPLAY_MORE'
      IMPORTING
         result = pb_multi_select.
ELSE.
  CALL FUNCTION 'ICON_CREATE'
      EXPORTING
         name = 'ICON_ENTER_MORE'
      IMPORTING
         result = pb_multi_select.
ENDIF.
You can change the button as you see fit with multiple different calls inside of "IF" or "CASE" statements.  Please see documentation for "ICON_CREATE" for other parameters.
Hope this helps,
Brian