Title says it all.
Try making the texture completely transparent, then using the button functions, make the texture no longer transparent, or something like that.
Use the _Appear for the part and texture you want to appear and make the texture transparent too. It will appear at the same time.
--EventString Lib.btnFuncs = function() Lib.Map.Part.TextureA.Transparency = 0 end
--EventScript btnFuncs = function() script.Parent.Part.TextureA.Transparency = 0 end
what do you mean