If you are wondering why you are getting “sm.isSelected is not a function” error when trying to drag and drop records from EditorGridPanel then the answer is… CellSelectionModel.
Drag and drop in ExtJs works with RowSelectionModel but EditorGridPanel – with CellSelectionModel by default (which doesn’t implement isSelected method).
The quick and easy solution is to use RowSelectionModel instead (if it’s acceptable for you of course).
sm: new Ext.grid.RowSelectionModel()
Otherwise you most probably will have to override ExtJs implementation of drag and drop for EditorGridPanel.