Hiya. So in my "Engine" I'm able to switch window resolutions(800x600, 1024x768, & fullscreen), but if I switch into fullscreen then back into a windowed mode the window gets stuck at the top-most window. No matter what. If I click on a window, it displays behind my engine window. This ONLY happens after I come out of fullscreen. I Googled it and I couldn't really find anything useful. Here is my code to change the window:

bool Window::ChangeWindowMode(int windowMode)
{
	if(windowMode == Window::m_WindowProperties.m_windowMode)
	{
		return false;
	}

	if(windowMode == WindowModes::WM_800X600)
	{
		Window::m_WindowProperties.m_windowMode = WindowModes::WM_800X600;
		m_WindowProperties.m_windowWidth = 800;
		m_WindowProperties.m_windowHeight = 600;
		m_WindowProperties.m_windowPosX = (GetSystemMetrics(SM_CXSCREEN) - m_WindowProperties.m_windowWidth) / 2;
		m_WindowProperties.m_windowPosY = (GetSystemMetrics(SM_CYSCREEN) - m_WindowProperties.m_windowHeight) / 2;

		if(m_WindowProperties.m_windowMode == WindowModes::WM_FULLSCREEN)
		{
			ChangeDisplaySettings(nullptr, 0);
		}

		SetWindowLongPtr(m_hWnd, GWL_EXSTYLE, WS_EX_OVERLAPPEDWINDOW);
		SetWindowLongPtr(m_hWnd, GWL_STYLE, WS_OVERLAPPEDWINDOW ^ WS_THICKFRAME);
		SetWindowPos(m_hWnd, nullptr, m_WindowProperties.m_windowPosX, m_WindowProperties.m_windowPosY,
			m_WindowProperties.m_windowWidth, m_WindowProperties.m_windowHeight, SWP_SHOWWINDOW | SWP_NOZORDER);

	}
	else if(windowMode == WindowModes::WM_1024X768)
	{
		Window::m_WindowProperties.m_windowMode = WindowModes::WM_1024X768;
		m_WindowProperties.m_windowWidth = 1024;
		m_WindowProperties.m_windowHeight = 768;
		m_WindowProperties.m_windowPosX = (GetSystemMetrics(SM_CXSCREEN) - m_WindowProperties.m_windowWidth) / 2;
		m_WindowProperties.m_windowPosY = (GetSystemMetrics(SM_CYSCREEN) - m_WindowProperties.m_windowHeight) / 2;

		if(m_WindowProperties.m_windowMode == WindowModes::WM_FULLSCREEN)
		{
			ChangeDisplaySettings(nullptr, CDS_GLOBAL);
		}

		SetWindowLongPtr(m_hWnd, GWL_EXSTYLE, WS_EX_OVERLAPPEDWINDOW);
		SetWindowLongPtr(m_hWnd, GWL_STYLE, WS_OVERLAPPEDWINDOW ^ WS_THICKFRAME);
		SetWindowPos(m_hWnd, nullptr, m_WindowProperties.m_windowPosX, m_WindowProperties.m_windowPosY,
			m_WindowProperties.m_windowWidth, m_WindowProperties.m_windowHeight, SWP_SHOWWINDOW | SWP_NOZORDER);

		return true;
	}
	else if(windowMode == WindowModes::WM_FULLSCREEN)
	{
		Window::m_WindowProperties.m_windowMode = WindowModes::WM_FULLSCREEN;
		m_WindowProperties.m_windowWidth = GetSystemMetrics(SM_CXSCREEN);
		m_WindowProperties.m_windowHeight = GetSystemMetrics(SM_CYSCREEN);
		m_WindowProperties.m_windowPosX = m_WindowProperties.m_windowPosY = 0;

		DEVMODE dmScreenSettings;

		ZeroMemory(&dmScreenSettings, sizeof(DEVMODE));
		dmScreenSettings.dmPelsWidth = m_WindowProperties.m_windowWidth;
		dmScreenSettings.dmPelsHeight = m_WindowProperties.m_windowHeight;
		dmScreenSettings.dmBitsPerPel = 32;
		dmScreenSettings.dmDisplayFlags = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;

		ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN);

		SetWindowLongPtr(m_hWnd, GWL_EXSTYLE, WS_EX_APPWINDOW);
		SetWindowLongPtr(m_hWnd, GWL_STYLE, WS_POPUP);
		SetWindowPos(m_hWnd, nullptr, m_WindowProperties.m_windowPosX, m_WindowProperties.m_windowPosY,
			m_WindowProperties.m_windowWidth, m_WindowProperties.m_windowHeight, SWP_SHOWWINDOW | SWP_NOZORDER);
	}

	return true;
}

void DeviceResources::ChangeWindowMode(int windowMode)
{
	if(m_Window.ChangeWindowMode(windowMode))
	{
		m_d3dpp.BackBufferWidth = m_Window.m_WindowProperties.m_windowWidth;
		m_d3dpp.BackBufferHeight = m_Window.m_WindowProperties.m_windowHeight;

		if(windowMode == WindowModes::WM_FULLSCREEN)
		{
			m_d3dpp.Windowed = false;
		}
		else
		{
			m_d3dpp.Windowed = true;
		}

		m_pDevice->Reset(&m_d3dpp);
	}
}

Yeah, I noticed that. DX (at least with 9) adds the WS_EX_TOPMOST style to your window. So whenever I return from fullscreen I remove the style again. Before going fullscreen I store the current window styles (both style and extended style), and restore them afterwards.

Use SetWindowLong with GWL_EXSTYLE to do that.

Try adding ChangeDisplaySettings( NULL, NULL ) when coming out of fullscreen mode.

Alternatively, forget about using ChangeDisplaySettings entirely, and just use the native desktop resolution. You can then render to a smaller offscreen buffer and then scale up to the screen size.

"I got it to work properly. I added HWND_NOTTOPMOST to the second parameter of SetWindowPos. Thank you for the help."

Nevertheless, you should still call ChangeDisplaySettings( NULL, NULL ) when coming out of fullscreen mode to undo the temporary mode change.

"I got it to work properly. I added HWND_NOTTOPMOST to the second parameter of SetWindowPos. Thank you for the help."

Nevertheless, you should still call ChangeDisplaySettings( NULL, NULL ) when coming out of fullscreen mode to undo the temporary mode change.

..call ChangeDisplaySettings.. I do.

See my comments above. Have you determined that: 1. the code is reached? 2. there is no error?