This will unload all forms in memory before the calling form is unloaded. Not only does this unload each form, it also fires each form’s unload event, allowing for a more thorough clean up. Since this is placed in the Query_Unload event, errors can be handled and decisions can be made if the unloading should continue. This is especially useful when using other third-party controls such as the splitter control.

Place the following code in your main form’s Query_Unload event.

 Dim f As FormFor Each f In Forms    If f.hwnd <> Me.hwnd Then        Unload f    End IfNext