Disconnect any old events in OnApplyTemplate()

Author: robloo

Microsoft.Toolkit.Uwp.UI.Controls/ColorPicker/ColorPicker.cs

@@ -174,7 +174,8 @@ private static bool IsColorEmpty(Color color)
         /// </summary>
         protected override void OnApplyTemplate()
         {
-            //// TODO: We need to disconnect old events first.
+            // We need to disconnect old events first
+            this.ConnectEvents(false);
 
             this.ColorSpectrumControl              = this.GetTemplateChild<ColorSpectrum>(nameof(ColorSpectrumControl));
             this.ColorSpectrumAlphaSlider          = this.GetTemplateChild<Slider>(nameof(ColorSpectrumAlphaSlider));