Getting File Count in FileListBox with FilterComboBox

I am using a FileListBox and FilterComboBox.

I get the file count by int Count = FileListBox1->Items->Count.

When the mask is *.*, Count is correct.

When the Filter mask is set to other than *.*, the FileListBox correctly
displays only files matching the mask.  However, the file Count is still ALL the
files in the selected directory.
How can I easily get the count of the files selected by the mask?