columns.lockable Boolean (default: true)

If set to false the column will remain in the side of the TreeList into which its own locked configuration placed it.

This option is meaningful when the treelist has columns which are configured with a locked value. Setting it explicitly to false will prevent the user from locking or unlocking this column using the user interface.

Example - lockable columns

<div id="treeList" style="width: 500px"></div>
    columns: [
      { field: "id", locked: true, width: 100},
      { field: "name", width: 200 },
      { field: "age", width: 250, lockable: false }
    reorderable: true,
    dataSource: {
      data: [
        { id: 1, parentId: null, name: "Jane Doe", age: 22 },
        { id: 2, parentId: 1, name: "John Doe", age: 24 }
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