Hello again. I try to make transparent ImageButton in FormEX1 with (FormEx.dll) library. In normal Form1.Show, Form1 give me transparent PNG image like button, but when I try to use FormEx, on App_Start give me an error like: Unable to cast object of type 'System.Windows.Forms.Form' to type 'Dbasic.EnhancedControls.CEnhancedForm'. I try to make desktop application. How to do this? Thanks!