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I have a TreeTableView that I have working (mostly) the way I want.  I have a RowFactory set that supports Drag and Drop and that is working pretty well.  However, I need to be able to edit one of the columns and I can't seem to find a way to do that.

I have added `setOnEdit...` method calls to the column:

```	titleCol.setOnEditStart  {
		startEditingTitle(it)
	}
	titleCol.setOnEditCommit {
		commitEdit(it)
		endEditingTitle(it)
	}
	titleCol.setOnEditCancel {
		endEditingTitle(it)
	}```

But, even though these methods get called I can't actually edit the cell's contents.

What do I have to do to be able to edit the contents of the cells?