We have found a weird behaviour when we have the last column of the grid with resizable = false and the other ones set with resizable = true.
When you pass the mouse over the last column separator the resize cursor for the last resizable column is shown. If when it has disappeared, you click anywhere on the last column (remember that is not resizable, this is mandatory to reproduce the issue) you can resize the other column (even if you click at the right border of the last column header).
Thus, as a side effect, if we have some events on a custom column header renderer, these are not dispatched correctly.
You can try it in the fiddle below:
http://jsfiddle.net/ndn6X/26/
