Steps to Reproduce

1. run the test cause keikai.test / zss.issue.Composer1179 , 1179-serialize.zul
2. click the "serialize" button

Current Result

• SEVERE: Unable to serialize entry: _colCellSize= {r0_sheet_0=[[0, 13, 1, false, ],[1, 201, 3, false, ],[2, 24, 5, false, ],[3, 24, 7, false, ],[4, 24, 9, false, ],[5, 77, 11, false, ],[6, 77, 13, false, ],[7, 77, 15, false, ],[8, 77, 17, false, ],[9, 84, 19, false, ],[10, 14, 21, false, ],[11, 77, 23, false, ],[12, 77, 25, false, ],[13, 77, 27, false, ],[14, 77, 29, false, ],]}

  java.io.NotSerializableException: io.keikai.ui.impl.HeaderPositionHelper$HeaderPositionInfo
  at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185)

• java.io.NotSerializableException: io.keikai.ui.ToolbarButton

Expected Result

no error