IgrDataGrid ComboBoxColumn shows filtered drop-down when not in edit mode

[agoldenbaum]

Steps to Reproduce:

1. Run the attached sample project.
2. Click on one of the cells of the IgrComboBoxColumn to enter edit mode on it.
3. Click a different cell.
4. Click the same cell as in step 2.
5. Type "L"

Result:
The filtered combo box drop-down appears, displaying "Los Angeles" - even though the cell is not in edit mode.

Notes
The combo box column does not actually change its isEditable status. The prevention of edit mode is happening in the cellClicked event handler

column-types.zip