How to kill last image of animation...

[Wizard]

Hi everyone. My game is a SpaceFighter programmed with DelphiX. I followed Mr Farmer's advice and created a seperate class for the explosion, i.e.when my bullet hits my enemy the enemy image is replaced by an animated explosion:

 //The explosion class
  TExplode = class(TImageSprite)
  public
    constructor Create(AParent: TSprite); override;
  end;


Constructor TExplode.Create(AParent: TSprite);
begin
  inherited Create(AParent);
  self.Image := Form1.DXImageList1.Items[form1.ExplodeImageIndex];
  self.X := Enemy.X;
  self.Y := Enemy.Y;
  self.Width := Enemy.Image.Width;
  self.Height := Enemy.Image.Height;
  self.PixelCheck := False;
  self.AnimCount := Image.PatternCount;
  //self.AnimLooped:= True;
  self.AnimSpeed:= (60/1000) * UpdateSpeed;
end;

procedure TForm1.BulletCollision(Sender:TObject;var done:Boolean);
begin
   if (sender is TEnemy) then
        begin
             Enemy := TEnemy(sender);
             if (not Enemy.Hit) then
                begin
                     Explode := TExplode.Create(dxSpriteEngine1.Engine);
                     Enemy.hit := true;
                     Enemy.Dead;
                     Bullet.Dead;
                     Points := Points + 1000;
                     EnemyCount := EnemyCount + 1;
                     Enemy := TEnemy.create(dxspriteEngine1.Engine,dximageList1,EnemyLeftImageIndex);
                end;
        end
         else ...

Problem is that once the bullet hits the enemy the explosion animation runs perfectly but stops at the last image of the animation. This "last" image of the animation then stays on ths screen. How do I kill it? Explode.Dead kills it but then the animation does not run :-(