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Tree ComboBox Control

, 20 Feb 2012 CPOL
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Tree ComboBox Control
This is an old version of the currently published article.


Recently, I needed a tree control inside a combobox, and during my search on Google I found something, but it was a little more complicated than I required. I started to draft one myself, and am sharing the result with you.

Using the Code

Everything is based on CTreeComboBox, which is derived from standard CComboBox. Here I have CComboTreeCtrl variable member and methods characteristic to tree control. In CTreeComboBox::PreSubclassWindow, I create and initialize m_Tree and stretch on combobox dropdown list.

void CTreeComboBox::PreSubclassWindow() 
    // TODO: Add your specialized code here and/or call the base class


    CRect rect(0, 0, 0, 0);
    m_Tree.CreateEx(0, WC_TREEVIEW, NULL, dwStyle, rect, GetParent(), 0, NULL);


    dwStyle = 0x03 & GetStyle();

At first click, or arrow key down, the tree window will open.

void CTreeComboBox::OnLButtonDown(UINT nFlags, CPoint point) 
    // TODO: Add your message handler code here and/or call default

    m_bTree = ! m_bTree;

//    CComboBox::OnLButtonDown(nFlags, point);


BOOL CTreeComboBox::PreTranslateMessage(MSG* pMsg) 
    // TODO: Add your specialized code here and/or call the base class

    if(pMsg->message == WM_KEYDOWN && pMsg->wParam == VK_DOWN)
        return TRUE;

    return CComboBox::PreTranslateMessage(pMsg);

But tree window should close at second click, escape key, enter key or lost focus. I tried a few ways but I failed, so my solution was to send to the parent (CTreeComboBox) message to close.

LRESULT CTreeComboBox::OnCloseControl(WPARAM wParam, LPARAM lParam)
    m_bTree = FALSE;

    return 1;

ComboBox must setup with CBS_DROPDOWNLIST or else you'll be ASSERT Smile | :)

In order to use this control , you need include #include "TreeComboBox.h" and further handle combobox like it is a tree control (you can see how in the sample project).

Enjoy it!


  • 26th April, 2011: Initial version
  • 20th February, 2012: Added CTreeCtrl & GetTreeCtrl() method to CTreeComboBox class, so now it has full access to tree control


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author


Romania Romania
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Comments and Discussions

Discussions posted for the Published version of this article. Posting a message here will take you to the publicly available article in order to continue your conversation in public.
QuestionI vote you 5 PinmemberMatrix is everywhere20-Oct-14 16:23 
AnswerRe: I vote you 5 PinmemberFlaviu220-Oct-14 21:32 
GeneralMy vote of 2 Pinmemberstevehoang16-Oct-14 11:44 
GeneralRe: My vote of 2 PinmemberFlaviu216-Oct-14 21:01 
GeneralRe: My vote of 2 PinmemberFlaviu213-Nov-14 23:54 
GeneralRe: My vote of 2 Pinmemberstevehoang26-Nov-14 9:48 
GeneralRe: My vote of 2 PinmemberFlaviu226-Nov-14 22:26 
QuestionProblems with this control [modified] Pinmemberstevehoang16-Oct-14 9:19 
QuestionNice tree ComboBox Control! PinprofessionalVolynsky Alex16-Oct-14 4:55 
AnswerRe: Nice tree ComboBox Control! PinmemberFlaviu216-Oct-14 21:02 
QuestionRe: Nice tree ComboBox Control! PinprofessionalVolynsky Alex17-Oct-14 5:36 
Questioni vote of 5 Pinmemberxunonxyz22-Mar-13 6:28 
QuestionWhen Click on the checkbox it can not hide and show noting on combox's Edit Pinmembermaplewang8-Aug-12 6:53 
GeneralMy vote of 5 Pinmemberhuwuling3-May-12 6:10 
GeneralRe: My vote of 5 PinmemberFlaviu211-May-12 3:11 
Suggestionmodified in vs2003 Pinmembermagicpapacy11-Mar-12 17:30 
GeneralVS2008 : ComboTreeCtrl behind PinmemberMember 768188116-May-11 6:00 
GeneralRe: VS2008 : ComboTreeCtrl behind [modified] PinmemberFlaviu218-May-11 20:38 

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