Abstract base class creating an empty Panel.
tools.XRCed.params.CheckBox, tools.XRCed.params.ParamBinaryOr, tools.XRCed.params.ParamBitmap, tools.XRCed.params.ParamColour, tools.XRCed.params.ParamCombo, tools.XRCed.params.ParamContent, tools.XRCed.params.ParamFont, tools.XRCed.params.ParamImage, tools.XRCed.params.ParamInt, tools.XRCed.params.ParamMultilineText, tools.XRCed.params.ParamText, tools.XRCed.params.RadioBox