Hey there! I use the example script from the _GUICtrlListView_GetItemParam help file with 2 added lines to show my problem. After line 31 I add: _GUICtrlListView_SetColumnWidth($hListView, 0, $LVSCW_AUTOSIZE) The full script: #AutoIt3Wrapper_au3check_parameters=-d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 #include #include Opt('MustDeclareVars', 1) $Debug_LV = False ; Check ClassName being passed to ListView functions, set to True and use a handle to another control to see it work ; Warning