<p>I have a custom user control with a textbox on it and I'd like to expose the baseline (of the text in the textbox) snapline outside of the custom control.  I know that you create a designer (inherited from ControlDesigner) and override SnapLines to get access to the snaplines, but I'm wondering how to get the text baseline of a control that I have exposed by my custom user control.</p>

You're on the right track.  You will need to override the SnapLines property in your designr and do something like this:
```
```
Public Overrides ReadOnly Property SnapLines() As System.Collections.IList
    Get
        Dim snapLinesList As ArrayList = TryCast(MyBase.SnapLines, ArrayList)

        Dim offset As Integer
        Dim ctrl As MyControl = TryCast(Me.Control, MyControl)
        If ctrl IsNot Nothing AndAlso ctrl.TextBox1 IsNot Nothing Then
            offset = ctrl.TextBox1.Bottom - 5
        End If

        snapLinesList.Add(New SnapLine(SnapLineType.Baseline, offset, SnapLinePriority.Medium))

        Return snapLinesList

    End Get
End Property
```
```
In this example the usercontrol contains a textbox.  The code adds a new snapline that represents the baseline for the textbox.  The important thing is to calculate the offset correctly.