title: How to display a selected field unique values from a selected layer as rows headers in QTableWidget using python for a QGIS plugin?
body: <p>To build a form in Qt Designer for a QGIS plugin that does the following:</p>
  
  <p>After the user has selected a layer and a field, from comboboxes, the unique values of this field to be displayed as rows headers in QTableWidget using python</p>