combo boxes: re-post from Form group

[Sam Kuo]

This may sound a bit mouthful, but the desired outcome is simple. I'm not
code literate so could someone please help! Many thanks
The following codes sychronize two combo boxes, where the latter is limited
by the selection of the former. Right now records are filtered only after
both selections. But what I really want is:
1) record in form filtered after 1st combo box, and filtered futher after
2nd combo box.
2) have a OK button next to both combo boxes, so that filter doesn't take
place until the button is clicked.

Private Sub cboCategory_AfterUpdate()
Me.cboType.RowSource = "SELECT Type FROM" & _
" qryTypeCurrent WHERE CategoryID = " & Me.cboCategory & _
" ORDER BY Type"
Me.cboType = Me.cboType.ItemData(0)
End Sub

Private Sub cboType_AfterUpdate()
DoCmd.ApplyFilter , "Type = '" & cboType & "'"
End Sub
------------------
I also have another combo box in the same form which provides an alternative
mean of record finding. But I would like the previous 2-combo-box-set to be
cleared (display as blank) if this combo box is later used.

Private Sub cboDWGNo_AfterUpdate()
' Remove the filter.
Me.FilterOn = False
' Find the record that matches the control.
Dim rs As Object
Set rs = Me.Recordset.Clone
rs.FindFirst "[DWGNo] = '" & Me![cboDWGNo] & "'"
If Not rs.EOF Then Me.Bookmark = rs.Bookmark
End Sub