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added 231 characters in body

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edited Mar 19, 2015 at 14:26

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Column[{Panel["Panel 1"], Panel["Panel 2"], 
  Mouseover[Panel["Panel 3"], Column@{Panel["Panel 3"], Panel["Extra Panel"]}], 
  Panel["Panel 4"]}, Spacings -> {0, 0}]

enter image description here

Column[{Panel["Panel 1"], Panel["Panel 2"], 
  Dynamic@If[CurrentValue["MouseOver"], 
       Column@{Panel["Panel 3"], Panel["Extra Panel"]}, Panel["Panel 3"]], 
  Panel["Panel 4"]}, Spacings -> {0, 0}]

Column[{Panel["Panel 1"], Panel["Panel 2"], 
  Mouseover[Panel["Panel 3"], Column@{Panel["Panel 3"], Panel["Extra Panel"]}], 
  Panel["Panel 4"]}, Spacings -> {0, 0}]

enter image description here

Column[{Panel["Panel 1"], Panel["Panel 2"], 
  Mouseover[Panel["Panel 3"], Column@{Panel["Panel 3"], Panel["Extra Panel"]}], 
  Panel["Panel 4"]}, Spacings -> {0, 0}]

enter image description here

Column[{Panel["Panel 1"], Panel["Panel 2"], 
  Dynamic@If[CurrentValue["MouseOver"], 
       Column@{Panel["Panel 3"], Panel["Extra Panel"]}, Panel["Panel 3"]], 
  Panel["Panel 4"]}, Spacings -> {0, 0}]

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created Mar 19, 2015 at 14:21

kglr

400.5k
18
488
929

Column[{Panel["Panel 1"], Panel["Panel 2"], 
  Mouseover[Panel["Panel 3"], Column@{Panel["Panel 3"], Panel["Extra Panel"]}], 
  Panel["Panel 4"]}, Spacings -> {0, 0}]

enter image description here