GUI to edit matrix in Julia?

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Thanks for the pointer but after some investigation it seems that it is still work in progress to edit cells in place? See post: Edit a cell in TableView.
So with a code example, the question is how to edit matrix in-place in a GUI:

using DataFrames, TableView
mat = [1 4.0 7; 2 5.0 8; 3 6.0 9]
matdf = DataFrame(mat)
showtable(matdf)
# Is there anything like **edittable**?