If OpenWindow(0,0,0,500,250,"Window",#PB_Window_SystemMenu|#PB_Window_ScreenCentered) ButtonGadget(1,10,10,100,40,"Teststring 1"+#CRLF$+"Teststring 2") SetWindowLongPtr_(GadgetID(1),#GWL_STYLE,GetWindowLongPtr_(GadgetID(1),#GWL_STYLE) | #BS_MULTILINE) Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow EndIf