c - How to let the parent window of a child window (a.k.a. owned window) stay active with winapi? -

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I am writing a small application using WinAPi. There I have a window with a hair window (toolbox). I am able to keep it inside this window and so on, but my question is how to keep the main window active, if the child is window-oriented?

The main window is grayed out at this time.

The windows are created by: 

  hMainWindow = dialog box (.......); HChildWindow = CreateDialogParam (..., hMainWindow, ...); ShowWindow (hChildWindow, SW_SHOW);   
 Here is a small image of the behavior of two windows:  
 behavior of windows   
 
 
 I've found that just create it as  WS_CHILD  and obviously  WS_POPUP  as  no  resolves it, it also changes the full window coordinates for relative people so that I can position the window Do not take care to move again in the parent window 
 // Resolve

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