EnableExplicit #TVM_SETITEMHEIGHT = 4379 If OpenWindow(0,0,0,500,250,"Window",#PB_Window_SystemMenu|#PB_Window_ScreenCentered) TreeGadget(1,10,10,480,230,0) AddGadgetItem(1,-1,"Testitem 1",0,0) AddGadgetItem(1,-1,"Subitem",0,1) AddGadgetItem(1,-1,"Testitem 2",0,0) SendMessage_(GadgetID(1),#TVM_SETITEMHEIGHT,50, 0) Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow EndIf