Event notification from checkbox within TreeControl (from WTL)

[shivonkar]

I have CheckBox in TreeControl (from WTL). Please let me know how can i receive Event notification from checkbox when it is selected/unselected. I tried LButtonDOwm and OnClick but it does not work. For LButtonDOwn i used NOTIFY_HANDLER(IID_TC, WM_LBUTTONDOWN, OnLButtonDown) but control does not come to this. For click i am unable to detect on which item was clicked. NOTIFY_HANDLER(IID_TC, NM_CLICK, OnClick) Thanks Shiv

[algol]

Place the following code into OnClick: #define MSG_CHECKSTATECHANGE (WM_USER + 1001) DWORD dwpos = GetMessagePos(); TVHITTESTINFO ht; ht.pt.x = GET_X_LPARAM(dwpos); ht.pt.y = GET_Y_LPARAM(dwpos); ::MapWindowPoints(HWND_DESKTOP, pnmh->hwndFrom, &ht.pt, 1); ::TreeView_HitTest(lpnm->hwndFrom, &ht); // If click on checkbox then post user defined message if(TVHT_ONITEMSTATEICON & ht.flags) { PostMessage(MSG_CHECKSTATECHANGE, 0, (LPARAM)ht.hItem); } You can also send the MSG_CHECKSTATECHANGE message from TVN_KEYDOWN notify handler when SPACE key is pressed.