You could subclass your window and catch the WM_NCLBUTTONDOWN event.
Add to a Module
VB Code:
Public Declare Function SetWindowLong& Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long)
Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Const GWL_WNDPROC = (-4)
Public WinProcOld As Long
Private Const WM_NCLBUTTONDOWN = &HA1
Public Function WinProc(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If wMsg = WM_NCLBUTTONDOWN Then
'< -- Add code here
End If
WinProc = CallWindowProc(WinProcOld&, hwnd&, wMsg&, wParam&, lParam&)
End Function
Sub SubClassWnd(hwnd As Long)
WinProcOld& = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WinProc)
End Sub
Sub UnSubclassWnd(hwnd As Long)
SetWindowLong hwnd, GWL_WNDPROC, WinProcOld&
WinProcOld& = 0
End Sub
Add to a Form.
VB Code:
Private Sub Form_Load()
SubClassWnd hwnd
End Sub
Private Sub Form_Unload(Cancel As Integer)
UnSubclassWnd hwnd
End Sub