please help filtering collections using checkboxes

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VB

WPF

LINQ

hello... i have a WPF project that uses the ado.net entity framework 4.0 with visual studios 2010. i need to filter a listbox based on the input of multiple checkboxes. i have created an entity data model and a observable collection. the project loads correctly. the problem is i can not find anything on filtering a listbox based on checkboxes. here is what i have so far:

Imports System.Data.Objects

Public Class SearchMe

    Private db As New CraftingProjectsEntities
    Private ProjectsData As ProjectsCollection

    Private ProjectViewSource As CollectionViewSource
    Private WithEvents ProjectView As ListCollectionView

    Private Sub SearchMe_Loaded(sender As Object, e As System.Windows.RoutedEventArgs) Handles Me.Loaded
        Dim query = From p In db.Projects
                    Select p

        Me.ProjectsData = New ProjectsCollection(query, db)
        Me.ProjectViewSource = CType(Me.FindResource("ProjectViewSource"), CollectionViewSource)
        Me.ProjectView = CType(Me.ProjectViewSource.View, ListCollectionView)
        MyLists.ItemsSource = ProjectsData
    End Sub

    Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click

        Dim query = (From p In db.Projects
                    Join c In db.Colorings On p.ProjectID Equals c.ProjectID
                    Join s In db.Specials On p.ProjectID Equals s.ProjectID
                    Select p).ToList()


        Me.ProjectsData = New ProjectsCollection(query.ToList(), db)
        MyLists.ItemsSource = ProjectsData
    End Sub

    Private Sub Button2_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button2.Click
        MyLists.ItemsSource = Nothing
    End Sub

End Class

ok so my ProjectCollection is as ObservableCollection (of Project). i know collectionviews have built in filters. i'm just not sure how i would write the query.
thanks for any and all help. i don't know if this is possible but i have to try...