Design questions

[logan]

I have a dialog based application that has two property pages over it. The property page has a list control, basically the app is a softphone and the list control shows the active calls and it's status. All call handling (making calls, recieving calls, etc) is done by a singleton class and I made another singleton class called CUIManager to update the status of the listbox, statusbar, etc. CUIManager holds a pointer to the list control and I make updates through it. When a call comes in, I start a thread and call the related function in my CCallManager singleton class, CCallManager then calls functions in CUIManager to update the status bar, list control, etc.

//CPropertyPage derived CCallsPage for showing active calls
BOOL CCallsPage::OnInitDialog()
{
	CPropertyPage::OnInitDialog();
	CUIManager::GetInstance ().m_pList = &m_List;

...
}

//This is how I make updates
void CUIManager::SetCallStatus (int nItem, COLOUMN col, CString strMessage)
{
	m_pList->SetItemText (nItem, col, strMessage);
}

Now my question to you people is that, is there a better way of doing all this? I'm using quite a few singletons, so does it mean that the design is poor (excess of everything is bad, I guess)?

Another question that I had is, there is a statusbar in my main dialog which shows messages and all. For now I use a timer to set the text of it to default after certain time. Is there any better way of doing this?

Please share your views with me.

Thanks.