wpf - C# toggle visibility in Grid - slow speed -

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i'm creating interactive slideshow control in wpf/c#. i've want create similar lightbox , coverflow.

i'm using fading effect: http://www.codeproject.com/articles/57175/wpf-how-to-animate-visibility-property/?display=mobile

and code testing coverflow: http://d3dal3.blogspot.com/2009/04/wpf-cover-flow-tutorial-part-7.html

everything works ok if don't many covers in coverflow... if there more 5 takes > 3 - 4 seconds start fading animation (animation ok). when fade out layer , again fade in working perfectly, how ever when restart app , want fade in element need wait animation more 3, 4 seconds. seems wpf need render(?) collapsed element , animation starts... how can fix problem?

here code window:

<window> <grid> . . . . other content  <border x:name="panelloading" visibility="collapsed" common:visibilityanimation.animationtype="fade">         <grid>             <border background="black" opacity="0.6">              </border>             <grid>                  <flow:flowcontrol x:name="flow" margin="0" width="1000" height="800"></flow:flowcontrol>             </grid>         </grid>     </border> </grid></window>

if i'm understanding description, guess you're loading of images memory window starts up.

you load first image in main thread, use backgroundworker load upcoming images.


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