Mouse middle button in mapkeys

Hi all,

in Creo3, I created  a mapkey to put automatically a symbol in 2D drawings using "on entity" placement option and selecting a Csys in the 3D model tree.

But when you place a symbol, you must clic the mouse middle button to stop placement and to be able to select "OK" in the dialog box.

Unfortunately, the mouse middle button clic is not recorded in the mapkey. Running it, the mapkey stops at this step and do not end.

Mapkey sequence:
 mapkey dup @MAPKEY_LABELdup;\
mapkey(continued) ~ Activate `main_dlg_cur` `page_Annotate_control_btn` 1;\
mapkey(continued) ~ Command `ProCmdDwgCrSymInstCust` ;\
mapkey(continued) ~ Trail `UI Desktop` `UI Desktop` `DLG_PREVIEW_POST` `file_open`;\
mapkey(continued) ~ Select `file_open` `Ph_list.Filelist` 1 `csys_piping_iso.sym`;\
mapkey(continued) ~ Command `ProFileSelPushOpen_Standard@context_dlg_open_cmd` ;\
mapkey(continued) ~ Select `main_dlg_cur` `PHTLeft.AssyTree` 1 `node23`;\
mapkey(continued) ~ Activate `drawing_sym` `OK_push`;

I tried to copy a middle clic sequence from a trail file but it doesn' t work. It's like the middle button was kept pressed.
 

trail file sequence:
~ MButtonArm `main_dlg_cur` `proe_win` 9 1439 512 0 2 1536 902 1920 1200 73284
~ MButtonDisarm `main_dlg_cur` `proe_win` 9 1439 512 0 0 1536 902 1920 1200 73489

Any idea folks ?