Step = 0;
API_Init()
win = window_handle()
API_Check_Set(1,win)
toolbar = API_Toolbar_Create(1,win)
Button1 = API_Toolbar_AddButton(toolbar)

Command = API_Check_Command (1);
if ( Command == Toolbar1 )  
{
Second = API_Check_SecondaryCommand (1);
if (Second == NM_RCLICK )  
{
Num = API_Check_TertiaryCommand (1);
show_message ("Button right clicked.");
}
}
if ( Command == Button1 )
{
show_message ("Button1 left clicked.");
}