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