Oracle forms d2kwebutil.pll file d2kwebutil.plx file runtime error

hi,

I am trying to simiulate the button pressed, right mouse click, so that the attach popup menu to the button shows, for this i have use the following code from d2kwebutil, which i have compile in 11g 11.1.1.7.0 of forms, and move to oracle_home\forms directory.

the custom code which i have taken is this

PROCEDURE simulate_right_click IS

WM_RBUTTONDOWN CONSTANT PLS_INTEGER := 516; /* 0x0204*/

WM_RBUTTONUP CONSTANT PLS_INTEGER := 517; /* 0x0205 */

hWin PLS_INTEGER;      /* Item Window Handle */

     xpos NUMBER;

     ypos NUMBER;

BEGIN

-- Get the Window handle for item

hWin := get_item_property(NAME_IN('SYSTEM.TRIGGER_ITEM'), WINDOW_HANDLE);