Thank you for clarifying your scenario. Now I understand what you're actually trying to achieve. Unfortunately, this scenario is not yet supported by RadSlideView. The ItemPreviewTemplate is used mainly in scenarios that involve the AdjacentItemsPreviewMode property. Currently, RadSlideView does not have a mechanism to determine if there is an Image control inside its ItemPreviewTemplate and whether this Image has finished loading.
However, we think that the scenario you described should be supported by RadSlideView (i.e. the ItemPreviewTemplate should hide itself only after the image inside of the ItemTemplate has finished loading). I've logged this request in our tracking system and as soon as we prioritize it we will start working on it. Meanwhile, if you have further questions or comments, don't hesitate to contact us. I'd be glad to assist you.
Finally, let me thank you for the great feedback. I've also updated your Telerik points accordingly.
the Telerik team
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