Imports is not available

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VB

Hello!
I got one project, now i try to fix all bugs.
My project contains some projects, and start point - Main.project
Almost any classes there is similar error: can not define(gren underlile) imports.

For example: Imports Smouse.MailDocPro.Common.Objects and error is:

Error	1077	Type 'NavigationControl' is not defined.	C:\Sorgenti.NET\Maildoc\Main\Source\Smouse.MailDocPro.Ricerca.Ctl.2010\NavigationControls\FilterNavigationControl.vb	8	18	Smouse.MailDocPro.Ricerca.Ctl.2010

I have a beginner level and understand that solution i must find himself, but i dont know from what start. I saw book VB.NET, but here only basics knowledge and it was not helped.
Must say that all references is active and available.

Sorry for my regular useless question!

And for example, there are:

Sub LoadControl(ByVal objArguments As Hashtable)
            Controls.Clear()
            Select Case objArguments("DettViewControl").ToString()
                Case "Cerca"
                    Dim wRicercheCelineCtl As New Cerca(CInt(objArguments("SelectedUo")))
                     Controls.Add(wRicercheCelineCtl) ''300 line ''
                    wRicercheCelineCtl.Dock = DockStyle.Fill
            End Select

Error	300	'Add' is not a member of 'Controls'.

        End Sub

So, i can assume that i have problem with DLL files. thats use at references. Now i "Build" every project that to build a chain link