To use this code, add a flexgrid control to a form, and add the following to the MouseDown or MouseUp event of the control.
Private Sub MSFlexGrid1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
Dim cont As Integer
Dim found As Boolean
'Only do it if the button is the left one, and there
'are no mask keys pressed.
'Of course, you can vary this to fit your needs.
If (Button = vbLeftButton) And (Shift = 0) Then
With MSFlexGrid1
'Do not proceed if the row clicked is
'not the header row.
If (.RowHeight(0) < y) Then
Exit Sub
End If
'Initialize variables
cont = 0
found = False
'Find the column clicked using mouse coords
Do While (cont < .Cols) And Not (found)
If (.ColPos(cont) + .ColWidth(cont) < x) Then
cont = cont + 1
Else
found = True
End If
Loop
'If column found, proceed to run the appropriate code
If found Then
MsgBox "You clicked the header for column " & .TextMatrix(0, cont)
End If
End With
End If
End Sub
The above will work for one fixed row only. However, you can easily adapt it to multiple fixed header rows.