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I am creating a CExtComboBox dynamically:

CExtComboBox* pCombo = new CExtComboBox();

pCombo->m_bEnableAutoComplete = false;

pCombo->m_bEnableAutoFilter = true;

I am unable to make the filter popup list appear while typing. I compared my dynamically created control versus one created via resource. The resource one works just fine. I debugged the dynamic combo box and found out that in the method

CExtComboBoxBase::OnSubclassInnerEdit()

...

The hWnd is NULL which prevents m_wndInnerEditHook from being subclassed. Which than later in

CExtComboBoxBase::OnEditCtrlUpdate()

the inner edit control is NULL and the filterlist is not shown.

Is there anything I need to add to my dynamic creation to make this work?

Thank you very much for your test project. It helped us to fix this issue. Please update the source code for the following method:

CEdit * CExtComboBoxBase::OnQueryInnerEditCtrl() const
{
      ASSERT_VALID( this );
CEdit * pEdit = NULL;
DWORD dwWndStyle = GetStyle();
DWORD dwComboBoxType = dwWndStyle & 0x0003L;
      if( dwComboBoxType != CBS_DROPDOWNLIST )
      {
            ( const_cast < CExtComboBoxBase * > ( this ) ) -> OnSubclassInnerEdit();
            if( m_wndInnerEditHook.GetSafeHwnd() != NULL )
                  pEdit = (CEdit *)&m_wndInnerEditHook;
      }
      return pEdit;
}

Thanks for the fix. It works just fine!!

Thanks for the information. Unfortunetly that didn’t help. I have created a very simple sample application, which contains a dialog with one dynamic combobox and one created from a resource. The one created from the resource behaves in the way I would like to have the dynamic one.

I’ll send you the zipped solution via email.

Your combo box is not based on the CBS_HASSTRINGS style. The CExtComboBox class does not know which text lines should be displayed in the filter popup list box.