Cleaning up the slider demo. Removed duplicate slider. Added missing tooltip.
Cleaning up the slider demo.
Removed duplicate slider.
Added missing tooltip.

ButchersBoy/MaterialDesignInXamlToolkit,DingpingZhang/MaterialDesignInXamlToolkit,ButchersBoy/MaterialDesignInXamlToolkit,ButchersBoy/MaterialDesignInXamlToolkit