#LB_SETHORIZONTAL = $194

If OpenWindow(0,0,0,500,250,"Window",#PB_Window_SystemMenu|#PB_Window_ScreenCentered)
  ListViewGadget(1,10,10,100,100,0)
  AddGadgetItem(1,-1,"Laaaaaaaaaaaaaaaanger Text",0,0)
  
  SendMessage_(GadgetID(1), #LB_SETHORIZONTAL, 150, #Null)
Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow
EndIf