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If in a CExtTreeCtrl a tooltip for an item is shown which ist not selected and one clicks with the mouse on that item, OnTreeMouseClick is not called with nClick==1 (Button released). The next click works.

Thank you for reporting us this issue. To fix it, please update the source code for the following method:

void CExtTreeCtrl::OnTreeMouseMove( UINT nFlags, CPoint point )
{
            ASSERT_VALID( this );
            nFlags;
bool bTrackSelection =
                        (           ( ( GetStyle() & TVS_TRACKSELECT ) != 0) 
                        ||           ( ( TreeGetStyleEx() & (__EXT_TREE_EX_HOVER_TREE_BOXES|__EXT_TREE_EX_HOVER_CHECK_BOXES|__EXT_TREE_EX_HOVER_RADIO_BUTTONS) ) != 0 ) 
                        ) 
                        ? true: false;
            if( ! bTrackSelection )
                        return;
bool bInfoTip = ( ( GetStyle() & TVS_INFOTIP ) != 0 ) ? true: false;
DWORD dwHitTestFlagsNew = 0;
HTREEITEM htiHoverNew = NULL;
CPoint ptScreen = point;
            ClientToScreen( &ptScreen );
HWND hWndFromPoint = ::WindowFromPoint( ptScreen );
            if(                     hWndFromPoint != NULL
                        &&        (           hWndFromPoint == m_hWnd
                                    ||           hWndFromPoint == m_wndContentExpand.GetSafeHwnd()
                                    )
                        )
                        htiHoverNew = TreeItemHitTest( point, dwHitTestFlagsNew );
            if(                     htiHoverNew == m_htiHover
                        &&        dwHitTestFlagsNew == m_dwLastHoverHitTestFlags
                        )
                        return;
            if( m_htiHover != NULL )
            {
                        CRect rcItemEntire;
                        TreeItemRectGet( m_htiHover, rcItemEntire, e_tirt_entire );
                        InvalidateRect( &rcItemEntire );
            }
            if( htiHoverNew != NULL )
            {
                        if( m_htiHover != htiHoverNew )
                        {
                                    CRect rcItemEntire;
                                    TreeItemRectGet( htiHoverNew, rcItemEntire, e_tirt_entire );
                                    InvalidateRect( &rcItemEntire );
                        }
                        if( GetCapture() != this )
                                    SetCapture();
            }
            else
            {
                        if( GetCapture() == this )
                                    ReleaseCapture();
            }
            if ( htiHoverNew != NULL )
                        CWnd::SetCapture();
            else
                        ReleaseCapture();
            OnTreeItemSetCursor(
                        htiHoverNew,
                        dwHitTestFlagsNew
                        );
            OnTreeItemHoverChanged(
                        htiHoverNew,
                        dwHitTestFlagsNew,
                        m_htiHover,
                        m_dwLastHoverHitTestFlags
                        );
            m_htiHover = htiHoverNew;
            m_dwLastHoverHitTestFlags = dwHitTestFlagsNew;
            if( bInfoTip )
            {
                        bool bDeactivate = true;
                        if( htiHoverNew != NULL )
                        {
                                    CRect rcLabel;
                                    TreeItemRectGet( htiHoverNew, rcLabel, e_tirt_label );
                                    if( rcLabel.PtInRect( point ) )
                                    {
                                                CRect rcClient;
                                                GetClientRect( &rcClient );
                                                CWnd::RepositionBars( 0, 0xFFFF, 0, CWnd::reposQuery, &rcClient, &rcClient );
                                                if(                     rcLabel.left < rcClient.left
                                                            ||           rcLabel.right > rcClient.right
                                                            )
                                                {
                                                            bDeactivate = false;
                                                            m_wndContentExpand.Activate(
                                                                        rcLabel,
                                                                        this,
                                                                        __ECWAF_DEF_EXPANDED_ITEM_PAINTER|__ECWAF_NO_CAPTURE
                                                                                    |__ECWAF_PASS_WM_LBUTTONUP
                                                                                    |__ECWAF_PASS_WM_RBUTTONUP
                                                                                    |__ECWAF_PASS_WM_MBUTTONUP
                                                                        );

                                                            SetTimer( __EXT_TREE_CONTROL_TIMER_ID_TRACKHOVER, 100, NULL );
                                                }
                                    }
                        }
                        if( bDeactivate )
                                    m_wndContentExpand.Deactivate();
            } // if( bInfoTip )
}