how to send messages between diferents dialogs?

[Timbk]

Hello, in my aplication there are two dialogs CCalibracionDlg and DlgMap1 both derived from Cdialog, when I press a button in DlgMap1 i have to send a message to CCalibracionDlg, how can i do this?
I've been trying to do this with PostMessage(hWnd, WM_MYCUSTOMMESSAGE,(WPARAM) wParam,(LPARAM) lParam ); or SendMessage , but in DlgMap1 how can i get the hWnd to CCalibracionDlg?
Thanks in advance.

[Nikitozz]

It depends on your project and it's really hard to say how without seeing some of your code.
For example you can save the CCalibracionDlg window's handle as a member in DlgMap1 class.