Hi all, I am using a from: transformed: at some point, and I just got the transformation block being called with a nil value when the from pane gets a selection of nothing. my showOn: block does not state allowNil, so I did not expect this to happen. Is it expected that transformation blocks always check for nil-ness of their arguments? -- Johan Fabry jfabry(a)dcc.uchile.cl - http://dcc.uchile.cl/~jfabry PLEIAD Lab - Computer Science Department (DCC) - University of Chile