Next column is loaded when checkstate gets changed in QColumnView

Create a columnview with checkboxes. Whenever I check or uncheck an item(without selecting the row), next column is loaded automatically. The next column should be loaded only when the particular row is selected/clicked.

This is implemented in QTreeView correctly. When the checkbox state changes in QTreeView it'll update only the checkstate and the will not expand though it has children. I hope the same logic must be applied here also.

[Attached PyQt code]