public async Task OpenMediaAsync(Media item) {
this.Item = item;
TitleText.Text = Item.Title;
TitleText.ToolTip = Item.Title;
PositionText.Text = "";
playerBusiness = new WmpPlayerBusiness(Player);
playerBusiness.PositionChanged += playerBusiness_PositionChanged;
playerBusiness.Show();
await playerBusiness.PlayVideoAsync(Item, false);
}