////////////////
// State Changes
////////////////
public override Task <bool> CanCloseViewModelAsync()
{
ToolServices.PassSoundShouldBePlayed -= ToolServices_PassSoundShouldBePlayed;
ToolServices.StoneCapturesShouldBePlayed -= ToolServices_StoneCapturesShouldBePlayed;
ToolServices.StonePlacementShouldBePlayed -= ToolServices_StonePlacementShouldBePlayed;
_portraitUpdateTimer.End();
return(base.CanCloseViewModelAsync());
}