B2.54, Sequencer - Scene Preview/Render

Hi all,

in Blender 2.53B, under the Video Editing Screne in the properties of the Strips one could choose ‘Scene Preview/Render’ and activate ‘Open GL Preview’ (see attachment B253b.jpg).
In Blender 2.54 this option has gone!?! (see attachment 2.54.jpg)

Where I can find this option in Blender 2.54?

Thanks for any support!

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