hi, I want to browse every layer of a file(*.dwg) besides closed the diaolg box.I do a dialog to open differened layer.There are several buttons on the dialog interface .I can open some one of layers used a button , but I can not sure that the dialog box is open to make other button to use. After I used a button ,the dialog box is closed. Who can tell me the way to sure the dialog box is opened after I used a button? thank you lily