When adding a CheckboxSelectionModel to a grid it looks fine in the designer, but when the exported project is run in the browser the checkbox column is missing because it's not being included in the column model.

I appreciate that this can't be done using entirely declarative syntax as you need two references (selModel and a column) to the same selection model, so the exported .ui.js code would need to declare the column model before the main object and then reference it in the declaration.

Currently I'm having to add the code below to the corresponding .js file after initialization, which is hardly a major pain, more a minor irritation.