error on second dialog Create

when i create a window, destroy it then create it again i get error pointing to:

Code:

BOOL CGdiObject::Attach(HGDIOBJ hObject)
{
this line ->	ASSERT(m_hObject == NULL);      // only attach once, detach on destroy
	if (hObject == NULL)
		return FALSE;
	CHandleMap* pMap = afxMapHGDIOBJ(TRUE); // create map if not exist
	ASSERT(pMap != NULL);
	pMap->SetPermanent(m_hObject = hObject, this);
	return TRUE;
}

this is my code:

Code:

header file:
CCTS m_CTS;


cpp file in a menu command event:
void CChateXDlg::OnMCTS() 
{
	if(IsWindow(m_CTS.GetSafeHwnd()) == FALSE)
	{
		m_CTS.Create(IDD_CTS_DIALOG, GetDesktopWindow());
		m_CTS.ShowWindow(SW_SHOW);
	}
	else
	{
		m_CTS.ShowWindow(SW_RESTORE);
		m_CTS.SetForegroundWindow();
	}
}

anybody know why do i get this error? Thanks.

edit: doesnt matter i fixed it

Do you
m_hObject = NULL;
Immediately after you free it?
Otherwise, it may think you've still got the old one when you're trying to get a new one.

its fixed look what happened i have a class CLabel derived CStatic that is on the CTS dialog and on PreSubclassWindow i create a font which is declared in the header, problem is i didnt think that when destroying the dialog the class is not destroyed so the font was created 2 times that was the error i just used m_font.DeleteObject(); and that fixed it