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    <p>This article helped me a lot: <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/bb773183%28v=vs.85%29.aspx" rel="nofollow noreferrer">Subclassing Controls</a></p> <p>First, I create a separate message processing function for processing child messages.</p> <pre><code>LRESULT CALLBACK MyClass::ChildWindowProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData) { static PAINTSTRUCT Ps; static RECT Rect; static HBRUSH hBrush1 = CreateSolidBrush(RGB(50,100,255)); static HBRUSH hBrush2 = CreateSolidBrush(RGB(255,100,50)); HDC hDc; LRESULT lResult; switch (uMsg) { case WM_PAINT: switch (uIdSubclass) { case 1: hDc = BeginPaint(hWnd, &amp;Ps); Rect.left = 0; Rect.right = (LONG) (((double) ITEM2_WIDTH) * Status::GI()-&gt;Get_JobCurPercentage()); Rect.top = 0; Rect.bottom = ITEM_HEIGHT - 3; FillRect(hDc, &amp;Rect, hBrush1); EndPaint(hWnd, &amp;Ps); break; case 2: hDc = BeginPaint(hWnd, &amp;Ps); Rect.left = 0; Rect.right = (LONG) (((double) ITEM2_WIDTH) * Status::GI()-&gt;Get_JobTotPercentage()); Rect.top = 0; Rect.bottom = ITEM_HEIGHT - 3; FillRect(hDc, &amp;Rect, hBrush2); EndPaint(hWnd, &amp;Ps); break; default: return DefSubclassProc(hWnd, uMsg, wParam, lParam); } break; case WM_NCDESTROY: //ReleaseDC(hWnd, hDc); return DefSubclassProc(hWnd, uMsg, wParam, lParam); break; default: return DefSubclassProc(hWnd, uMsg, wParam, lParam); } return 0; } </code></pre> <p>Next, I bind this function to the controls:</p> <pre><code>SetWindowSubclass( /*_In_ HWND hWnd*/ ed_cur_Progress.hWnd, /*_In_ SUBCLASSPROC pfnSubclass*/ ChildWindowProc, /*_In_ UINT_PTR uIdSubclass*/ 1, /*_In_ DWORD_PTR dwRefData*/ (DWORD_PTR) NULL); SetWindowSubclass( /*_In_ HWND hWnd*/ ed_tot_Progress.hWnd, /*_In_ SUBCLASSPROC pfnSubclass*/ ChildWindowProc, /*_In_ UINT_PTR uIdSubclass*/ 2, /*_In_ DWORD_PTR dwRefData*/ (DWORD_PTR) NULL); </code></pre> <p>And, that's all! The result is amazing.</p> <p><img src="https://i.stack.imgur.com/ksWnY.png" alt="appearance"></p>
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    1. POHow do I paint a child window with FillRect()?
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    1. COThe device context returned from `BeginPaint` should not be relased by calling `ReleaseDC`. Worse though is that you're passing an uninitialized `HDC` variable to `ReleaseDC` in your `WM_DESTROY` handler. Another note on cleanup: `WM_NCDESTROY` is the final message sent to a window. That's where you should put your cleanup code.
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    2. CO@Tim Thank your for the information; I will change my code according to it. How do I relase the device context then? Do I release it in the first place?
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    3. COThe resources associated with the device context returned from `BeginPaint` are released by the system when you call `EndPaint`. I understand that leaving a 'dangling' `HDC` looks wrong, but it isn't. For reference see [Drawing in the Client Area](http://msdn.microsoft.com/en-us/library/windows/desktop/dd162487.aspx).
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