Handling exceptions from a Method in a dialog that can be model and modeless - exception

Question

This is an extract of a method in CDialog class:
void CDialog1::Method()
{
try
{
// Snip
}
catch (CException* e_)
{
const gsl::not_null<CException*> e{ e_ };
e->ReportError();
e->Delete();
}
catch (const _com_error& e)
{
AfxMessageBox(e.ErrorMessage(), MB_OK | MB_ICONERROR);
}
}
There is no issue with this function when it is ran from an instance of the modal dialog.
But, in another part of my application I load the same dialog as a hidden modeless dialog. And I call the same function. Eg:
void CDialog2::SomeTask()
{
if (m_pDialog1 != nullptr)
{
m_pDialog1->Method();
}
}
In this second scenario there is an issue with Method when an error is encountered. CDialog2 needs to handle the display of the errors from what I understand, because the hidden instance will appear if it shows a messagebox.
How do I get around this? Note that CDialog1 has a boolean method IsHiddenMode so we know if we are running it as a model or not.
What is the easy way to change my methods to cater for both scenarios:
When CDialog1 calls the method in it's modal dialog.
When CDialog2 calls the method using the modeless member variable of CDialog1.
I tend to overcomplicate my explanations so I hope it makes sense.

Answer 1

I adjusted the Method to detect if the dialog was in hidden mode and throw the exception, eg:
catch (const _com_error& e)
{
if (IsHiddenMode())
{
throw;
}
else
{
AfxMessageBox(e.ErrorMessage(), MB_OK | MB_ICONERROR);
}
}
That way, the calling dialog could catch and handle with a try / catch block.