#2004 Tiki Sheet remove / insert row not working

v1.9.1
open
nobody
5
2012-12-08
2005-12-08
hobster
No

When using uppercase letters combined with numbers in
cells you can not add rows to a tiki sheet.

E.g. I created a TikiSheet that has one column and one
row in the only cell there is the value 'U001'. When
you want to add a new row the error 'An error occured
inexistant row in grid.getRow' occurs.

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