(Question) Black Box Issue

[GamebP]

Version/Branch of Dear ImGui:

Version 1.91.3 WIP, Branch: Docking

Back-ends:

imgui_impl_dx9 + imgui_impl_win32.cpp

Compiler, OS:

Windows 10 + Visual Studio 2022 (v143)

Full config/build information:

No response

Details:

My Issue/Question:
My current X problem is, that I have CreateWindowExA with CreateDevice, CreateImGui.
And then it creates a rendered from D3D9, then loads the ImGui, then calls EndFrame.
But at the end I need to call... to make it not crash since I want to use ImGuiNotify to display some data at bottom left corner.

if (ImGui::GetIO().ConfigFlags & ImGuiConfigFlags_ViewportsEnable) 
{
    ImGui::UpdatePlatformWindows();
    ImGui::RenderPlatformWindowsDefault();
}

I just want it to not create a black box when doing CreateHWindow (for short CreateWindowExA from (winuser.h)).
It is CreateHWindow issue but can't get rid of it.
So my Y solution could be getting rid of the Black box but at the same time I am able to see Notifications at bottom left corner. Like I Need to move the imgui menu that has the alot of data not stay at the same place.
Removing black box -> fixes the movment for (main window) and removes (yeap!) child from the main Generator.exe

Screenshots/Video:

Minimal, Complete and Verifiable Example code:

BlackBoxImgui.zip

[ocornut]

Question seems to have nothing to do with dear imgui.
Sorry but #1586