TreeView item lost higlight color after minimize - winapi

Question

I have simple win32 application (not dialog box), and treeview in this application.
All works, but if I have selected item in the treeview, and I minimize and restore application, selected item changes blue higlighting color to grayed color.
How to correct this without using custom draw?
If I have treeview in the dialog box, selected item has always blue color.
CODE:
HWND g_hTree;
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
HINSTANCE hInst;
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG Msg;
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return (int) Msg.wParam;
}
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TREEVIEWTEST));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_TREEVIEWTEST);
wcex.lpszClassName = L"TreeViewTestClass";
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
InitCommonControls();
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(L"TreeViewTestClass", L"Tree View Test", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
void AddItems();
#define TVS_STYLES (TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS | TVS_SHOWSELALWAYS | TVS_INFOTIP | TVS_TRACKSELECT | WS_VSCROLL | WS_TABSTOP)
#define ID_TREEVIEW 505
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_CREATE:
{
g_hTree = CreateWindowEx(0, WC_TREEVIEWW, L"Test_Tree_View", WS_CHILD | WS_VISIBLE | WS_BORDER | TVS_STYLES, 10, 10, 240, 480, hWnd, (HMENU)ID_TREEVIEW, NULL, NULL);
AddItems();
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
void AddItems()
{
TVITEM tvi;
HTREEITEM htSelected;
TVINSERTSTRUCT tvinsert; // struct to config out tree control
HTREEITEM htParent; // Tree item handle
HTREEITEM htBefore; // .......
HTREEITEM htRoot;
tvinsert.hParent=NULL; // top most level no need handle
tvinsert.hInsertAfter=TVI_ROOT; // work as root level
tvinsert.item.mask=TVIF_TEXT|TVIF_IMAGE|TVIF_SELECTEDIMAGE;
tvinsert.item.pszText=L"Parent1";
tvinsert.item.iImage=0;
tvinsert.item.iSelectedImage=1;
htParent = TreeView_InsertItem(g_hTree, &tvinsert);
htRoot = htParent;
htBefore = htParent;
tvinsert.hParent=htParent; // handle of the above data
tvinsert.hInsertAfter=TVI_LAST; // below parent
tvinsert.item.pszText=L"Child 1";
htParent = TreeView_InsertItem(g_hTree, &tvinsert);
tvinsert.hParent=htParent;
tvinsert.item.pszText=L"Child Of Child 1";
htParent = TreeView_InsertItem(g_hTree, &tvinsert);
tvinsert.hParent=htBefore; // handle of the above data
tvinsert.hInsertAfter=TVI_LAST; // below parent
tvinsert.item.pszText=L"Child 2";
htParent = TreeView_InsertItem(g_hTree, &tvinsert);
tvinsert.hParent=NULL; // top most level no need handle
tvinsert.hInsertAfter=TVI_LAST; // work as root level
tvinsert.item.pszText=L"Parent2";
htParent = TreeView_InsertItem(g_hTree, &tvinsert);
}

Answer 1

It seems your tree-view control is losing focus when the window is minimized. You can try handling WM_ACTIVATE and using SetFocus to manually set focus to the tree-view control.