How to display BannerIcon in banner of HubTile?

You can achieve this by using HubTile ShowBannerTileIcon and BannerIcon property.

/// Sets whether BannerIcon needs to be displayed in BannerTile
this.HubTile1.ShowBannerIcon = true;
/// Sets BannerIcon in BannerTile type of HubTile.
this.HubTile1.BannerIcon = this.ImageListAdv.Images[0];
Sets whether BannerIcon needs to be displayed in BannerTile
Me.HubTile1.ShowBannerIcon = True
Sets BannerIcon in BannerTile type of HubTile.
Me.HubTile1.BannerIcon = Me.ImageListAdv.Images[0]