My Grid has more or less the shape I want it to have, thank you Andrea.
Now I want to leave the Grid for the buttons below it,
and I prefer the TAB key to do this.
At the moment the TAB key works within the Grid, but I don't need
this functionality, at least not in this Grid.
I use the standard structure:
grid and buttons within panel and sizer, all this in a wx.Frame.
e