a232dd49_ced_Process_Control___Open_APC__Description
[Plug-In] Symbolbutton [Remarks] sourcecode available, OAPC Dual License [Description] 
Shows a toggle button with a selectable symbol; This button can be used for toggling on/off while a changing symbol is displayed; here several common elements like a knob, a valve, a pump, a electrical lamp or switch, a motor, a horn or other things can be configured without the need to use an external image.
OpenAPC - Open Source Advanced Process Control - Open APC
Description