this.dropdownTable.addSelectionListener(new SelectionAdapter() {
      @Override
      public void widgetSelected(final SelectionEvent e) {
        boolean selected = e.detail != SWT.CHECK;
        boolean isCtrlPressed = (e.stateMask & SWT.MODIFIER_MASK) == SWT.CTRL;
        TableItem chosenItem = (TableItem) e.item;

        // Given the ability to filter we need to find the item's
        // table index which may not match the index in the itemList
        int itemTableIndex = AdvocateNatCombo.this.dropdownTable.indexOf(chosenItem);

        // This case handles check actions
        if (!selected) {
          if (!chosenItem.getChecked()) {
            AdvocateNatCombo.this.selectionStateMap.put(chosenItem.getText(), Boolean.FALSE);
          } else {
            if (!AdvocateNatCombo.this.multiselect) {
              for (String key : selectionStateMap.keySet()) {
                AdvocateNatCombo.this.selectionStateMap.put(key, Boolean.FALSE);
              }
            }
            AdvocateNatCombo.this.selectionStateMap.put(chosenItem.getText(), Boolean.TRUE);
          }
        } else if (!AdvocateNatCombo.this.useCheckbox) {
          if (AdvocateNatCombo.this.multiselect && isCtrlPressed) {
            boolean isSelected = AdvocateNatCombo.this.dropdownTable.isSelected(itemTableIndex);
            AdvocateNatCombo.this.selectionStateMap.put(chosenItem.getText(), isSelected);
          } else {
            // A single item was selected. Clear all previous state
            for (String item : AdvocateNatCombo.this.itemList) {
              AdvocateNatCombo.this.selectionStateMap.put(item, Boolean.FALSE);
            }

            // Set the state for the selected item
            AdvocateNatCombo.this.selectionStateMap.put(chosenItem.getText(), Boolean.TRUE);
          }
        } else if (selected) {
          if (!chosenItem.getChecked()) {
            AdvocateNatCombo.this.selectionStateMap.put(chosenItem.getText(), Boolean.FALSE);
          }
        }

        // Mouse up and Selection Events get fired the wrong way around on iOS
        // This change makes sure that the Mouse up event gets fired again after the selection event
        if (!AdvocateNatCombo.this.multiselect && AdvocateNatCombo.this.useCheckbox) {
          Event event = new Event();
          event.widget = AdvocateNatCombo.this;
          event.display = AdvocateNatCombo.this.getDisplay();
          event.type = SWT.MouseUp;
          event.data = chosenItem;
          AdvocateNatCombo.this.notifyListeners(SWT.MouseUp, event);
        }

        updateTextControl(false);
      }
    });

combo.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseUp(final MouseEvent e) {
        if (!AdvocateNatTableComboBoxCellEditor.this.multiselect && e.data != null) {
          commit(MoveDirectionEnum.NONE,
              !AdvocateNatTableComboBoxCellEditor.this.multiselect && AdvocateNatTableComboBoxCellEditor.this.editMode == EditModeEnum.INLINE);
          if (!AdvocateNatTableComboBoxCellEditor.this.multiselect && AdvocateNatTableComboBoxCellEditor.this.editMode == EditModeEnum.DIALOG) {
            // hide the dropdown after a value was selected in the combo
            // in a dialog
            combo.hideDropdownControl();
          }
        }
      }
    });

        combo.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseUp(MouseEvent e) {
                // Mouse up and Selection Events get fired in the wrong order
                // on iOS when clicking the checkbox. In this scenario the
                // NatCombo will fire a Mouse up event programmatically with set
                // data, to ensure that the processing is done in the correct
                // order.
                boolean isSingleSelectWithCheckbox = !ComboBoxCellEditor.this.multiselect && ComboBoxCellEditor.this.useCheckbox;
                if (!isSingleSelectWithCheckbox || e.data != null) {

                    commit(MoveDirectionEnum.NONE,
                            (!ComboBoxCellEditor.this.multiselect && ComboBoxCellEditor.this.editMode == EditModeEnum.INLINE));
                    if (!ComboBoxCellEditor.this.multiselect && ComboBoxCellEditor.this.editMode == EditModeEnum.DIALOG) {
                        // hide the dropdown after a value was selected in the
                        // combo in a dialog
                        combo.hideDropdownControl();
                    }
                }
            }
        });