Create custom windows User Control, Add any windows form control you like on it
Use Below code to initialize palette set
publicclassCommands{internalstaticPaletteSetps=newPaletteSet("My First Palette");[CommandMethod("Test")]publicvoidTest(){try{//To Avoid Creating Duplicate Palettesif(ps.Count>0){ps.Visible=true;return;}varcontainer=newContainner1();ps.Add("Test",container);ps.Visible=true;}catch(System.Exceptionex){Application.ShowAlertDialog($"Something went wrong error:{ex.Message}");}}}