Thanks for the quick reply.
I‘ve created my own *.ascx but I don’t know how to access the ‘upload-wizard’. My 1st approach to solve this problem was:
public override void LoadSettings()
{
if (this.EntryId < 0) this.Visible = false;
//...
}
With this solution, I was only hiding the control and got an empty custom-page where the user has to click 'next'. So, I want to skip this step to avoid an empty page.