Melt one stick of butter and mix with graham crackers. Press into bottom of pan (9x13" or larger). Chill approximately 10 to 15 minutes until set. Beat together eggs, softened butter, powdered sugar and vanilla until smooth. Pour and spread over crust. Layer bananas, well drained pineapple and strawberries over sugar mixture. Spread thawed Cool Whip over top and sprinkle with nuts.